http_fopen_wrapper: fix [-Wanalyzer-deref-before-check]

warning: check of ‘*resource.scheme’ for NULL after already dereferencing it [-Wanalyzer-deref-before-check]
  186 |                 use_ssl = resource->scheme && (ZSTR_LEN(resource->scheme) > 4) && ZSTR_VAL(resource->scheme)[4] == 's';
      |                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Although resource->scheme is already dereferenced on line 163 in the IF condition

Author: Girgias

ext/standard/http_fopen_wrapper.c

@@ -160,6 +160,7 @@ static php_stream *php_stream_url_wrap_http_ex(php_stream_wrapper *wrapper,
 		return NULL;
 	}
 
+	ZEND_ASSERT(resource->scheme);
 	if (!zend_string_equals_literal_ci(resource->scheme, "http") &&
 		!zend_string_equals_literal_ci(resource->scheme, "https")) {
 		if (!context ||
@@ -183,7 +184,7 @@ static php_stream *php_stream_url_wrap_http_ex(php_stream_wrapper *wrapper,
 			return NULL;
 		}
 
-		use_ssl = resource->scheme && (ZSTR_LEN(resource->scheme) > 4) && ZSTR_VAL(resource->scheme)[4] == 's';
+		use_ssl = (ZSTR_LEN(resource->scheme) > 4) && ZSTR_VAL(resource->scheme)[4] == 's';
 		/* choose default ports */
 		if (use_ssl && resource->port == 0)
 			resource->port = 443;