vircgroupv2: fix virCgroupV2GetCpuCfsQuota for "max" value

If the first value in cpu.max is "max" return from function.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1741837Signed-off-by: NPavel Hrdina <phrdina@redhat.com>
Reviewed-by: NJiri Denemark <jdenemar@redhat.com>

src/util/vircgroupv2.c

@@ -1582,8 +1582,10 @@ virCgroupV2GetCpuCfsQuota(virCgroupPtr group,
         return -1;
     }
 
-    if (STREQLEN(str, "max", 3))
+    if (STREQLEN(str, "max", 3)) {
         *cfs_quota = ULLONG_MAX / 1000;
+        return 0;
+    }
 
     if (virStrToLong_ll(str, &str, 10, cfs_quota) < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,