New helper - current_umask()

current->fs->umask is what most of fs_struct users are doing.
Put that into a helper function.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
index 0d049b8..c696d01 100644
--- a/fs/hpfs/super.c
+++ b/fs/hpfs/super.c
@@ -477,7 +477,7 @@
 
 	uid = current_uid();
 	gid = current_gid();
-	umask = current->fs->umask;
+	umask = current_umask();
 	lowercase = 0;
 	conv = CONV_BINARY;
 	eas = 2;