Merge pull request #7345 from JacobBarthelmeh/coverity

Coverity fixes

wolfcrypt/src/asn.c

@@ -15019,7 +15019,7 @@ int wc_ValidateDate(const byte* date, byte format, int dateType)
 
     ltime = wc_Time(0);
 #ifndef NO_TIME_SIGNEDNESS_CHECK
-    if (sizeof(ltime) == sizeof(word32) && (int)ltime < 0){
+    if (sizeof(ltime) == sizeof(word32) && (sword32)ltime < 0){
         /* A negative response here could be due to a 32-bit time_t
          * where the year is 2038 or later. */
         WOLFSSL_MSG("wc_Time failed to return a valid value");

wolfcrypt/src/tfm.c

@@ -1104,9 +1104,9 @@ void fp_mod_2d(fp_int *a, int b, fp_int *c)
 
    bmax = ((unsigned int)b + DIGIT_BIT - 1) / DIGIT_BIT;
 
-   /* If a is negative and bmax is larger than FP_SIZE, then the
+   /* If a is negative and bmax is greater than or equal to FP_SIZE, then the
     * result can't fit within c. Just return. */
-   if (c->sign == FP_NEG && bmax > FP_SIZE) {
+   if (c->sign == FP_NEG && bmax >= FP_SIZE) {
       return;
    }