[PATCH] mm, vmpressure: Fix a signedness bug in vmpressure_register_event()

[Dan Carpenter]

The "mode" and "level" variables are enums and in this context GCC will
treat them as unsigned ints so the error handling is never triggered.

I also removed the bogus initializer because it isn't required any more
and it's sort of confusing.

Fixes: 3cadfa2b9497 ("mm/vmpressure.c: convert to use match_string() helper")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
 mm/vmpressure.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index f3b50811497a..fe077500cf20 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -362,7 +362,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
        struct vmpressure *vmpr = memcg_to_vmpressure(memcg);
        struct vmpressure_event *ev;
        enum vmpressure_modes mode = VMPRESSURE_NO_PASSTHROUGH;
-       enum vmpressure_levels level = -1;
+       enum vmpressure_levels level;
        char *spec, *spec_orig;
        char *token;
        int ret = 0;
@@ -376,7 +376,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
        /* Find required level */
        token = strsep(&spec, ",");
        level = match_string(vmpressure_str_levels, VMPRESSURE_NUM_LEVELS, 
token);
-       if (level < 0) {
+       if ((int)level < 0) {
                ret = level;
                goto out;
        }
@@ -385,7 +385,7 @@ int vmpressure_register_event(struct mem_cgroup *memcg,
        token = strsep(&spec, ",");
        if (token) {
                mode = match_string(vmpressure_str_modes, VMPRESSURE_NUM_MODES, 
token);
-               if (mode < 0) {
+               if ((int)mode < 0) {
                        ret = mode;
                        goto out;
                }
-- 
2.20.1