switch may_mknod() to umode_t

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index 85bb44f..e275dc3 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2472,7 +2472,7 @@
 	return error;
 }
 
-static int may_mknod(mode_t mode)
+static int may_mknod(umode_t mode)
 {
 	switch (mode & S_IFMT) {
 	case S_IFREG: