btrfs: squash lines for simple wrapper functions

Remove unneeded variables and assignments.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index dcd39cc..494e6b1 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -45,9 +45,7 @@
 
 struct btrfs_path *btrfs_alloc_path(void)
 {
-	struct btrfs_path *path;
-	path = kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS);
-	return path;
+	return kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS);
 }
 
 /*