Fixes coccicheck warning:
drivers/md/dm-snap.c:1064:3-18: WARNING: Assignment of 0/1 to bool variable
drivers/md/dm-snap.c:1152:1-16: WARNING: Assignment of 0/1 to bool variable
drivers/md/dm-snap.c:1317:1-16: WARNING: Assignment of 0/1 to bool variable
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
                        DMERR("Read error in exception store: "
                              "shutting down merge");
                        down_write(&s->lock);
-                       s->merge_failed = 1;
+                       s->merge_failed = true;
                        up_write(&s->lock);
                }
                goto shut;
 
 shut:
        down_write(&s->lock);
-       s->merge_failed = 1;
+       s->merge_failed = true;
        b = __release_queued_bios_after_merge(s);
        up_write(&s->lock);
        error_bios(b);
        INIT_LIST_HEAD(&s->list);
        spin_lock_init(&s->pe_lock);
        s->state_bits = 0;
-       s->merge_failed = 0;
+       s->merge_failed = false;
        s->first_merging_chunk = 0;
        s->num_merging_chunks = 0;
        bio_list_init(&s->bios_queued_during_merge);