mm/zsmalloc.c: remove unused variable

The variable 'entry' is no longer used and the compiler rightly complains
that it should be removed.

../mm/zsmalloc.c: In function `zs_pool_stat_create':
../mm/zsmalloc.c:648:17: warning: unused variable `entry' [-Wunused-variable]
  struct dentry *entry;
                 ^~~~~

Rework to remove the unused variable.

Link: http://lkml.kernel.org/r/[email protected]
Fixes: 4268509 ("zsmalloc: no need to check return value of debugfs_create functions")
Signed-off-by: Anders Roxell <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

mm/zsmalloc.c

@@ -645,8 +645,6 @@ DEFINE_SHOW_ATTRIBUTE(zs_stats_size);
 
 static void zs_pool_stat_create(struct zs_pool *pool, const char *name)
 {
-	struct dentry *entry;
-
 	if (!zs_stat_root) {
 		pr_warn("no root stat dir, not creating <%s> stat dir\n", name);
 		return;