change into hex string constants to avoid overflow warnings

Reviewed-by: Richard Levitte <levitte@openssl.org>

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>

test/hmactest.c

@@ -38,10 +38,8 @@ static struct test_st {
         "e9139d1e6ee064ef8cf514fc7dc83e86",
     },
     {
-        {
-            0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
-            0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
-        }, 16, "Hi There", 8,
+	"\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b",
+        16, "Hi There", 8,
         "9294727a3638bb1c13f48ef8158bfc9d",
     },
     {
@@ -49,10 +47,8 @@ static struct test_st {
         "750c783e6ab0b503eaa86e310a5db738",
     },
     {
-        {
-            0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
-            0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
-        }, 16, {
+	"\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa\xaa",
+        16, {
             0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
             0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,
             0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd, 0xdd,