Clean up field_poison.c

src/fldeff_misc.c

@@ -1200,29 +1200,35 @@ bool8 IsLargeBreakableDecoration(u16 metatileId, bool8 checkBase)
     return FALSE;
 }
 
+#define tState  data[0]
+#define tMosaic data[1]
+
 static void Task_FieldPoisonEffect(u8 taskId)
 {
     s16 *data = gTasks[taskId].data;
 
-    switch (data[0])
+    switch (tState)
     {
     case 0:
-        data[1] += 2;
-        if (data[1] > 8)
-            data[0]++;
+        tMosaic += 2;
+        if (tMosaic > 8)
+            tState++;
         break;
     case 1:
-        data[1] -= 2;
-        if (data[1] == 0)
-            data[0]++;
+        tMosaic -= 2;
+        if (tMosaic == 0)
+            tState++;
         break;
     case 2:
         DestroyTask(taskId);
         return;
     }
-    SetGpuReg(REG_OFFSET_MOSAIC, (data[1] << 4) | data[1]);
+    SetGpuReg(REG_OFFSET_MOSAIC, (tMosaic << 4) | tMosaic);
 }
 
+#undef tState
+#undef tMosaic
+
 void FldEffPoison_Start(void)
 {
     PlaySE(SE_FIELD_POISON);