drmemory: remove bug 978 suppression

Bug is fixed, so suppression is no longer needed.

Bug #978.

qa/drmemory.suppress

@@ -9,19 +9,6 @@ libmagic.so.1!file_apprentice
 libmagic.so.1!magic_load
 suricata!main
 
-LEAK
-name=bug #978
-*
-suricata!SMTPLocalStorageAlloc
-suricata!AppLayerGetProtocolParserLocalStorage
-suricata!AlpProtoFinalizeThread
-suricata!AlpProtoFinalize2Thread
-suricata!StreamTcpReassembleInitThreadCtx
-suricata!StreamTcpThreadInit
-suricata!TmThreadsSlotPktAcqLoop
-libpthread.so.0!start_thread
-libc.so.6!__clone 
-
 LEAK
 name=useless warning, likely DrMemory bug
 *