possible heap corruption fix (revert this if i'm wrong)

we allocate bp via calloc earlier, but didn't free it at the end of proc.

iguana/dpow/dpow_fsm.c

@@ -265,6 +265,7 @@ void dpow_statemachinestart(void *ptr)
     void **ptrs = ptr;
     struct supernet_info *myinfo; struct dpow_info *dp; struct dpow_checkpoint checkpoint;
     int32_t i,j,ht,extralen,destprevvout0,srcprevvout0,src_or_dest,numratified=0,kmdheight,myind = -1; uint8_t extras[10000],pubkeys[64][33]; cJSON *ratified=0,*item; struct iguana_info *src,*dest; char *jsonstr,*handle,*hexstr,str[65],str2[65],srcaddr[64],destaddr[64]; bits256 zero,MoM,merkleroot,srchash,destprevtxid0,srcprevtxid0; struct dpow_block *bp; struct dpow_entry *ep = 0; uint32_t MoMdepth,duration,minsigs,starttime,srctime;
+	int32_t bp_alloc = 0;
 	memset(&zero,0,sizeof(zero));
     MoM = zero;
     srcprevtxid0 = destprevtxid0 = zero;
@@ -297,7 +298,7 @@ void dpow_statemachinestart(void *ptr)
     }
     if ( (bp= dp->blocks[checkpoint.blockhash.height]) == 0 )
     {
-        bp = calloc(1,sizeof(*bp));
+		bp = calloc(1, sizeof(*bp)); bp_alloc = 1;
         //printf("allocate bp for %s ht.%d -> %s\n",src->symbol,checkpoint.blockhash.height,dest->symbol);
         Numallocated++;
         bp->MoM = MoM;
@@ -596,6 +597,9 @@ void dpow_statemachinestart(void *ptr)
     dp->ratifying -= bp->isratify;
     // dp->blocks[bp->height] = 0;
     bp->state = 0xffffffff;
+	
+	// heap corruption detected?
+	if (bp_alloc) free(bp);
     free(ptr);
 }