libcgroup: add upstream patch that fixes infinite loop in cgrulesengd (#5133)

The patch comes from:
https://sourceforge.net/p/libcg/libcg/ci/master/tree/
SHA1-id: 1bce3ab63968022e97599bbd73ec1a66aacf45bc

Minor manual tweak added to avoid setting patch_args

srcpkgs/libcgroup/patches/api.c-fix-infinite-loop.patch

@@ -0,0 +1,38 @@
+Date: Tue, 8 Dec 2015 16:53:41 +0100
+Subject: [PATCH] api.c: fix infinite loop
+
+If getgrnam or getpwuid functions failed, the program entered
+an infinite loop, because the rule pointer was never advanced.
+This is now fixed by updating the pointer before continuing
+to the next iteration.
+---
+ src/api.c | 8 ++++++--
+ 1 file changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/src/api.c b/src/api.c
+index d6c9d3a..ef796ac 100644
+--- src/api.c
++++ src/api.c
+@@ -2775,13 +2775,17 @@ static struct cgroup_rule *cgroup_find_matching_rule_uid_gid(uid_t uid,
+ 			/* Get the group data. */
+ 			sp = &(rule->username[1]);
+ 			grp = getgrnam(sp);
+-			if (!grp)
++			if (!grp) {
++				rule = rule->next;
+ 				continue;
++			}
+ 
+ 			/* Get the data for UID. */
+ 			usr = getpwuid(uid);
+-			if (!usr)
++			if (!usr) {
++				rule = rule->next;
+ 				continue;
++			}
+ 
+ 			/* If UID is a member of group, we matched. */
+ 			for (i = 0; grp->gr_mem[i]; i++) {
+-- 
+2.10.2
+

srcpkgs/libcgroup/template

@@ -1,7 +1,7 @@
 # Template file for 'libcgroup'
 pkgname=libcgroup
 version=0.41
-revision=5
+revision=6
 build_style=gnu-configure
 configure_args="--sbindir=/usr/bin --enable-pam-module-dir=/usr/lib/security"
 hostmakedepends="flex automake libtool"