Declare tentative return types for ext/phar (php#7052)

Author: kocsismate

ext/phar/phar_object.c

@@ -5023,7 +5023,7 @@ PHP_METHOD(PharFileInfo, decompress)
 		zend_throw_exception_ex(spl_ce_BadMethodCallException, 0,
 			"Phar error: Cannot decompress %s-compressed file \"%s\" in phar \"%s\": %s", compression_type, entry_obj->entry->filename, entry_obj->entry->phar->fname, error);
 		efree(error);
-		return;
+		RETURN_THROWS();
 	}
 
 	entry_obj->entry->old_flags = entry_obj->entry->flags;