Address some code-analysis issues.

Expression '...' is always true.
The 'b->init' variable is assigned values twice successively

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4753)

crypto/asn1/x_algor.c

@@ -28,18 +28,19 @@ IMPLEMENT_ASN1_DUP_FUNCTION(X509_ALGOR)
 
 int X509_ALGOR_set0(X509_ALGOR *alg, ASN1_OBJECT *aobj, int ptype, void *pval)
 {
-    if (!alg)
+    if (alg == NULL)
         return 0;
+
     if (ptype != V_ASN1_UNDEF) {
         if (alg->parameter == NULL)
             alg->parameter = ASN1_TYPE_new();
         if (alg->parameter == NULL)
             return 0;
     }
-    if (alg) {
-        ASN1_OBJECT_free(alg->algorithm);
-        alg->algorithm = aobj;
-    }
+
+    ASN1_OBJECT_free(alg->algorithm);
+    alg->algorithm = aobj;
+
     if (ptype == 0)
         return 1;
     if (ptype == V_ASN1_UNDEF) {

crypto/bio/bss_acpt.c

@@ -450,7 +450,6 @@ static long acpt_ctrl(BIO *b, int cmd, long num, void *ptr)
             data->accepted_mode &= ~BIO_SOCK_NONBLOCK;
         break;
     case BIO_C_SET_FD:
-        b->init = 1;
         b->num = *((int *)ptr);
         data->accept_sock = b->num;
         data->state = ACPT_S_ACCEPT;

crypto/bio/bss_mem.c

@@ -147,23 +147,19 @@ static int mem_buf_free(BIO *a, int free_all)
 {
     if (a == NULL)
         return 0;
-    if (a->shutdown) {
-        if ((a->init) && (a->ptr != NULL)) {
-            BUF_MEM *b;
-            BIO_BUF_MEM *bb = (BIO_BUF_MEM *)a->ptr;
-
-            if (bb != NULL) {
-                b = bb->buf;
-                if (a->flags & BIO_FLAGS_MEM_RDONLY)
-                    b->data = NULL;
-                BUF_MEM_free(b);
-                if (free_all) {
-                    OPENSSL_free(bb->readp);
-                    OPENSSL_free(bb);
-                }
-            }
-            a->ptr = NULL;
+
+    if (a->shutdown && a->init && a->ptr != NULL) {
+        BIO_BUF_MEM *bb = (BIO_BUF_MEM *)a->ptr;
+        BUF_MEM *b = bb->buf;
+
+        if (a->flags & BIO_FLAGS_MEM_RDONLY)
+            b->data = NULL;
+        BUF_MEM_free(b);
+        if (free_all) {
+            OPENSSL_free(bb->readp);
+            OPENSSL_free(bb);
         }
+        a->ptr = NULL;
     }
     return 1;
 }

crypto/ec/ec2_smpl.c

@@ -603,9 +603,9 @@ int ec_GF2m_simple_is_on_curve(const EC_GROUP *group, const EC_POINT *point,
     if (!BN_GF2m_add(lh, lh, y2))
         goto err;
     ret = BN_is_zero(lh);
+
  err:
-    if (ctx)
-        BN_CTX_end(ctx);
+    BN_CTX_end(ctx);
     BN_CTX_free(new_ctx);
     return ret;
 }
@@ -656,8 +656,7 @@ int ec_GF2m_simple_cmp(const EC_GROUP *group, const EC_POINT *a,
     ret = ((BN_cmp(aX, bX) == 0) && BN_cmp(aY, bY) == 0) ? 0 : 1;
 
  err:
-    if (ctx)
-        BN_CTX_end(ctx);
+    BN_CTX_end(ctx);
     BN_CTX_free(new_ctx);
     return ret;
 }
@@ -698,8 +697,7 @@ int ec_GF2m_simple_make_affine(const EC_GROUP *group, EC_POINT *point,
     ret = 1;
 
  err:
-    if (ctx)
-        BN_CTX_end(ctx);
+    BN_CTX_end(ctx);
     BN_CTX_free(new_ctx);
     return ret;
 }

crypto/err/err.c

@@ -502,15 +502,13 @@ static unsigned long get_error_values(int inc, int top, const char **file,
         es->err_buffer[i] = 0;
     }
 
-    if ((file != NULL) && (line != NULL)) {
+    if (file != NULL && line != NULL) {
         if (es->err_file[i] == NULL) {
             *file = "NA";
-            if (line != NULL)
-                *line = 0;
+            *line = 0;
         } else {
             *file = es->err_file[i];
-            if (line != NULL)
-                *line = es->err_line[i];
+            *line = es->err_line[i];
         }
     }
 

crypto/store/loader_file.c

@@ -962,8 +962,8 @@ static OSSL_STORE_INFO *file_load_try_decode(OSSL_STORE_LOADER_CTX *ctx,
                                     ui_method, ui_data);
 
             if (try_matchcount > 0) {
-                if (matching_handlers)
-                    matching_handlers[*matchcount] = handler;
+
+                matching_handlers[*matchcount] = handler;
 
                 if (handler_ctx)
                     handler->destroy_ctx(&handler_ctx);