Replace virStringListLength where actual lenght is not needed

Some callers don't need to know the actual lenght of the list but only
care whether the required element is present or the list is non-empty.
Don't calculate the list length in those cases.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/lxc/lxc_native.c

@@ -568,7 +568,7 @@ lxcNetworkParseDataIPs(const char *name,
         family = AF_INET6;
 
     ipparts = virStringSplit(value->str, "/", 2);
-    if (virStringListLength((const char * const *)ipparts) != 2 ||
+    if (!ipparts || !ipparts[0] || !ipparts[1] ||
         virSocketAddrParse(&ip->address, ipparts[0], family) < 0 ||
         virStrToLong_ui(ipparts[1], NULL, 10, &ip->prefix) < 0) {
 

src/qemu/qemu_driver.c

@@ -17739,7 +17739,7 @@ qemuDomainGetResctrlMonData(virQEMUDriverPtr driver,
         return -1;
     }
 
-    if (virStringListLength((const char * const *)features) == 0)
+    if (!features || !*features)
         return 0;
 
     for (i = 0; i < dom->def->nresctrls; i++) {

src/storage/storage_backend_sheepdog.c

@@ -157,8 +157,7 @@ virStorageBackendSheepdogRefreshAllVol(virStoragePoolObjPtr pool)
 
         cells = virStringSplit(lines[i], " ", 0);
 
-        if (cells != NULL &&
-            virStringListLength((const char * const *)cells) > 2) {
+        if (cells != NULL && cells[0] && cells[1]) {
             if (virStorageBackendSheepdogAddVolume(pool, cells[1]) < 0)
                 return -1;
         }