switch path_init() to exec_permission()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index 7c8a930..cf25546 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1554,7 +1554,7 @@
 			if (!S_ISDIR(dentry->d_inode->i_mode))
 				goto fput_fail;
 
-			retval = file_permission(file, MAY_EXEC);
+			retval = exec_permission(dentry->d_inode, 0);
 			if (retval)
 				goto fput_fail;
 		}