mm/zsmalloc.c: change stat type parameter to int

zs_stat_inc/dec/get() uses enum zs_stat_type for the stat type, however
some callers pass an enum fullness_group value.  Change the type to int to
reflect the actual use of the functions and get rid of 'enum-conversion'
warnings

Link: http://lkml.kernel.org/r/20170731175000.56538-1-mka@chromium.org
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Doug Anderson <dianders@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/zsmalloc.c

@@ -551,20 +551,23 @@ static int get_size_class_index(int size)
 	return min_t(int, ZS_SIZE_CLASSES - 1, idx);
 }
 
+/* type can be of enum type zs_stat_type or fullness_group */
 static inline void zs_stat_inc(struct size_class *class,
-				enum zs_stat_type type, unsigned long cnt)
+				int type, unsigned long cnt)
 {
 	class->stats.objs[type] += cnt;
 }
 
+/* type can be of enum type zs_stat_type or fullness_group */
 static inline void zs_stat_dec(struct size_class *class,
-				enum zs_stat_type type, unsigned long cnt)
+				int type, unsigned long cnt)
 {
 	class->stats.objs[type] -= cnt;
 }
 
+/* type can be of enum type zs_stat_type or fullness_group */
 static inline unsigned long zs_stat_get(struct size_class *class,
-				enum zs_stat_type type)
+				int type)
 {
 	return class->stats.objs[type];
 }