libselinux: Fix errors found by coverity

commit aa62cd60f7192123b509c2518e7a2083e34a65a2 upstream.

Change-Id: I5e6222344b3baf4b9680aae1dad9652ce7d46f8a
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Dan Walsh <dwalsh@redhat.com>
diff --git a/src/mapping.c b/src/mapping.c
index f9858ce..6cd247e 100644
--- a/src/mapping.c
+++ b/src/mapping.c
@@ -67,7 +67,7 @@
 			goto err2;
 
 		k = 0;
-		while (p_in->perms && p_in->perms[k]) {
+		while (p_in->perms[k]) {
 			/* An empty permission string skips ahead */
 			if (!*p_in->perms[k]) {
 				k++;