Fix / suppress GCC warnings

Author: embhorn

src/internal.c

@@ -25910,16 +25910,7 @@ int SendData(WOLFSSL* ssl, const void* data, size_t sz)
         }
 #endif /* WOLFSSL_DTLS13 */
 
-#ifdef WOLFSSL_DTLS
-        if (ssl->options.dtls) {
-            buffSz = wolfSSL_GetMaxFragSize(ssl, (word32)sz - sent);
-        }
-        else
-#endif
-        {
-            buffSz = wolfSSL_GetMaxFragSize(ssl, (word32)sz - sent);
-
-        }
+        buffSz = wolfSSL_GetMaxFragSize(ssl, (word32)sz - sent);
 
         if (sent == (word32)sz) break;
 

src/ssl_bn.c

@@ -1151,7 +1151,12 @@ int wolfSSL_BN_cmp(const WOLFSSL_BIGNUM* a, const WOLFSSL_BIGNUM* b)
             ret = -1;
         }
         else {
+            PRAGMA_GCC_DIAG_PUSH
+            PRAGMA_GCC("GCC diagnostic ignored \"-Werror=duplicated-branches\"")
+            /* ignored warning here because the same return value 
+               was intentional */
             ret = WOLFSSL_FATAL_ERROR; /* also -1 */
+            PRAGMA_GCC_DIAG_POP
         }
     }
 

src/tls.c

@@ -5329,9 +5329,14 @@ int TLSX_SupportedFFDHE_Set(WOLFSSL* ssl)
         SupportedCurve* serverGroup;
 
         ext = TLSX_Find(priority, TLSX_SUPPORTED_GROUPS);
-        serverGroup = (SupportedCurve*)ext->data;
-
-        ret = tlsx_ffdhe_find_group(ssl, clientGroup, serverGroup);
+        if (ext == NULL) {
+            WOLFSSL_MSG("Could not find supported groups extension");
+            ret = 0;
+        }
+        else {
+            serverGroup = (SupportedCurve*)ext->data;
+            ret = tlsx_ffdhe_find_group(ssl, clientGroup, serverGroup);
+        }
     }
 
     TLSX_FreeAll(priority, ssl->heap);