md: fix a build warning

firogh · neilbrown · commit 4e023612325a · 2015-06-17T10:00:38.000+10:00
Warning like this:

drivers/md/md.c: In function "update_array_info":
drivers/md/md.c:6394:26: warning: logical not is only applied
to the left hand side of comparison [-Wlogical-not-parentheses]
      !mddev-&gt;persistent  != info-&gt;not_persistent||

Fix it as Neil Brown said:
mddev-&gt;persistent != !info-&gt;not_persistent ||

Signed-off-by: Firo Yang &lt;firogm@gmail.com&gt;
Signed-off-by: NeilBrown &lt;neilb@suse.de&gt;
diff --git a/drivers/md/md.c b/drivers/md/md.c
@@ -6394,7 +6394,7 @@ static int update_array_info(struct mddev *mddev, mdu_array_info_t *info)
 	    mddev->ctime         != info->ctime         ||
 	    mddev->level         != info->level         ||
 /*	    mddev->layout        != info->layout        || */
-	    !mddev->persistent	 != info->not_persistent||
+	    mddev->persistent	 != !info->not_persistent ||
 	    mddev->chunk_sectors != info->chunk_size >> 9 ||
 	    /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
 	    ((state^info->state) & 0xfffffe00)
