fs: fix chdir()

chdir() allocates memory using mormalise_path(). But if path_check_prereq()
returns error than memory isn't freed.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

fs/fs.c

@@ -347,8 +347,9 @@ int chdir(const char *pathname)
 
 	strcpy(cwd, p);
 
-	free(p);
 out:
+	free(p);
+
 	return errno;
 }
 EXPORT_SYMBOL(chdir);