network/dns_resolver/server: Add missing break in switch.

CID 991278, but that also causes CID 991176, so both of those
are fixed. Does *not* fix #12156. Might fix some of the outstanding
NFSv4 issues but I didn't look too hard.

src/add-ons/kernel/network/dns_resolver/server/main.cpp

@@ -146,6 +146,8 @@ MainLoop()
 		switch (code) {
 			case MsgGetAddrInfo:
 				result = GetAddrInfo(reinterpret_cast<char*>(buffer));
+				break;
+
 			default:
 				result = B_BAD_VALUE;
 				write_port(gReplyPort, MsgError, &result, sizeof(result));