fix invalid name bug

bad inode value is -1, not 0

kernel/Syscalls/execute.c

@@ -58,7 +58,7 @@ int32_t _sys_exec(uint8_t* name)
 
 	uint32_t parsed_inode = ext2_parse_path_to_inode_num((int8_t*)name);
 
-	if (!parsed_inode)
+	if (parsed_inode == -1)
 		return -EXEC_NOT_FOUND;
 
 	ext2_read_data(parsed_inode, 1, data.data16);