Fix potential length mismatch in non realloc case in wolfSSL_BIO_set_conn_hostname.

Thanks to Cal Page for the report.

Author: kareem-wolfssl

src/bio.c

@@ -2849,7 +2849,7 @@ int wolfSSL_BIO_flush(WOLFSSL_BIO* bio)
                 tmp = b->ip;
                 b->ip = (char*)XMALLOC(newLen+1, b->heap, DYNAMIC_TYPE_OPENSSL);
                 if (b->ip != NULL && tmp != NULL) {
-                    XMEMCPY(b->ip, tmp, newLen);
+                    XMEMCPY(b->ip, tmp, currLen < newLen : currLen ? newLen);
                     XFREE(tmp, b->heap, DYNAMIC_TYPE_OPENSSL);
                     tmp = NULL;
             }