fsnotify: convert runtime BUG_ON() to BUILD_BUG_ON()

The BUG_ON() statements to verify number of bits in ALL_FSNOTIFY_BITS
and ALL_INOTIFY_BITS are converted to build time check of the constant.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index ac6978d..105576d 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -815,7 +815,7 @@ static int __init inotify_user_setup(void)
 	BUILD_BUG_ON(IN_ISDIR != FS_ISDIR);
 	BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT);
 
-	BUG_ON(hweight32(ALL_INOTIFY_BITS) != 22);
+	BUILD_BUG_ON(HWEIGHT32(ALL_INOTIFY_BITS) != 22);
 
 	inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark,
 					       SLAB_PANIC|SLAB_ACCOUNT);