Use sizeof directly instead of definging TMEGAPKT_SIZE

Source/msg.cpp

@@ -55,7 +55,7 @@ TMegaPkt *msg_get_next_packet()
 {
 	TMegaPkt *result;
 
-	sgpCurrPkt = (TMegaPkt *)DiabloAllocPtr(TMEGAPKT_SIZE);
+	sgpCurrPkt = (TMegaPkt *)DiabloAllocPtr(sizeof(TMegaPkt));
 	sgpCurrPkt->pNext = NULL;
 	sgpCurrPkt->dwSpaceLeft = 32000;
 

structs.h

@@ -962,7 +962,6 @@ typedef struct TMegaPkt {
 	BYTE data[32000];
 } TMegaPkt;
 #pragma pack(pop)
-#define TMEGAPKT_SIZE sizeof(TMegaPkt)
 
 typedef struct TBuffer {
 	DWORD dwNextWriteOffset;