Duke3D: Fix internal compiler errors when script buffer is resized.

source/duke3d/src/gamedef.cpp

@@ -1046,7 +1046,7 @@ static void C_SetScriptSize(int32_t newsize)
     {
         if (BITPTR_IS_POINTER(i))
         {
-            if (EDUKE32_PREDICT_FALSE(apScript[i] < (intptr_t)apScript || apScript[i] >= (intptr_t)g_scriptPtr))
+            if (EDUKE32_PREDICT_FALSE(apScript[i] < (intptr_t)apScript || apScript[i] > (intptr_t)g_scriptPtr))
             {
                 g_errorCnt++;
                 buildprint("Internal compiler error at ", i, " (0x", hex(i), ")\n");
@@ -1060,11 +1060,17 @@ static void C_SetScriptSize(int32_t newsize)
     G_Util_PtrToIdx2(&g_tile[0].execPtr, MAXTILES, sizeof(tiledata_t), apScript, P2I_FWD_NON0);
     G_Util_PtrToIdx2(&g_tile[0].loadPtr, MAXTILES, sizeof(tiledata_t), apScript, P2I_FWD_NON0);
 
+    size_t old_bitptr_size = (((g_scriptSize + 7) >> 3) + 1) * sizeof(uint8_t);
+    size_t new_bitptr_size = (((newsize + 7) >> 3) + 1) * sizeof(uint8_t);
+
     auto newscript = (intptr_t *)Xrealloc(apScript, newsize * sizeof(intptr_t));
-    bitptr = (uint8_t *)Xrealloc(bitptr, (((newsize + 7) >> 3) + 1) * sizeof(uint8_t));
+    bitptr = (uint8_t *)Xrealloc(bitptr, new_bitptr_size);
 
     if (newsize > g_scriptSize)
+    {
         Bmemset(&newscript[g_scriptSize], 0, (newsize - g_scriptSize) * sizeof(intptr_t));
+        Bmemset(&bitptr[old_bitptr_size], 0, new_bitptr_size - old_bitptr_size);
+    }
 
     if (apScript != newscript)
     {