rpc: Introduce virNetServerGetProgramLocked helper function

This patch introduces virNetServerGetProgramLocked. It's a function to
determine which program has to be used for a given @msg. This function
will be reused in the next patch.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>

src/rpc/virnetserver.c

@@ -166,6 +166,26 @@ static void virNetServerHandleJob(void *jobOpaque, void *opaque)
     VIR_FREE(job);
 }
 
+/**
+ * virNetServerGetProgramLocked:
+ * @srv: server (must be locked by the caller)
+ * @msg: message
+ *
+ * Searches @srv for the right program for a given message @msg.
+ *
+ * Returns a pointer to the server program or NULL if not found.
+ */
+static virNetServerProgramPtr
+virNetServerGetProgramLocked(virNetServerPtr srv,
+                             virNetMessagePtr msg)
+{
+    size_t i;
+    for (i = 0; i < srv->nprograms; i++) {
+        if (virNetServerProgramMatches(srv->programs[i], msg))
+            return srv->programs[i];
+    }
+    return NULL;
+}
 
 static void
 virNetServerDispatchNewMessage(virNetServerClientPtr client,
@@ -175,18 +195,12 @@ virNetServerDispatchNewMessage(virNetServerClientPtr client,
     virNetServerPtr srv = opaque;
     virNetServerProgramPtr prog = NULL;
     unsigned int priority = 0;
-    size_t i;
 
     VIR_DEBUG("server=%p client=%p message=%p",
               srv, client, msg);
 
     virObjectLock(srv);
-    for (i = 0; i < srv->nprograms; i++) {
-        if (virNetServerProgramMatches(srv->programs[i], msg)) {
-            prog = srv->programs[i];
-            break;
-        }
-    }
+    prog = virNetServerGetProgramLocked(srv, msg);
     /* we can unlock @srv since @prog can only become invalid in case
      * of disposing @srv, but let's grab a ref first to ensure nothing
      * disposes of it before we use it. */