profiling: fix memory leak

For packets that were freed, not recycled, profiling memory wasn't
freed:

==15745== 13,312 bytes in 8 blocks are definitely lost in loss record 611 of 615
==15745==    at 0x4C2C494: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15745==    by 0xA190D5: SCProfilePacketStart (util-profiling.c:963)
==15745==    by 0x4E4345: PacketGetFromAlloc (decode.c:134)
==15745==    by 0x83FE75: FlowForceReassemblyPseudoPacketGet (flow-timeout.c:276)
==15745==    by 0x8413BF: FlowForceReassemblyForHash (flow-timeout.c:588)
==15745==    by 0x841897: FlowForceReassembly (flow-timeout.c:716)
==15745==    by 0x9540F6: main (suricata.c:2296)
==15745==
==15745== 14,976 bytes in 9 blocks are definitely lost in loss record 612 of 615
==15745==    at 0x4C2C494: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==15745==    by 0xA190D5: SCProfilePacketStart (util-profiling.c:963)
==15745==    by 0x4E4345: PacketGetFromAlloc (decode.c:134)
==15745==    by 0x83FE75: FlowForceReassemblyPseudoPacketGet (flow-timeout.c:276)
==15745==    by 0x841508: FlowForceReassemblyForHash (flow-timeout.c:620)
==15745==    by 0x841897: FlowForceReassembly (flow-timeout.c:716)
==15745==    by 0x9540F6: main (suricata.c:2296)

This patch addresses that.

src/decode.h

@@ -719,6 +719,7 @@ typedef struct DecodeThreadVars_
         }                                       \
         SCMutexDestroy(&(p)->tunnel_mutex);     \
         AppLayerDecoderEventsFreeEvents(&(p)->app_layer_events); \
+        PACKET_PROFILING_RESET((p));            \
     } while (0)