irc: require nick in "away" command callback

src/plugins/irc/irc-protocol.c

@@ -544,6 +544,7 @@ IRC_PROTOCOL_CALLBACK(away)
     struct t_irc_nick *ptr_nick;
 
     IRC_PROTOCOL_MIN_PARAMS(0);
+    IRC_PROTOCOL_CHECK_NICK;
 
     for (ptr_channel = server->channels; ptr_channel;
          ptr_channel = ptr_channel->next_channel)

tests/unit/plugins/irc/test-irc-protocol.cpp

@@ -725,6 +725,10 @@ TEST(IrcProtocolWithServer, away)
 
     SRV_INIT_JOIN;
 
+    /* missing nick */
+    RECV("AWAY");
+    CHECK_ERROR_NICK("away");
+
     ptr_nick = ptr_server->channels->nicks;
 
     LONGS_EQUAL(0, ptr_nick->away);