fix overflow check overflowing in R_DrawRepeatMaskedColumn

fixes renderer lock ups with transparent textures in software renderer

src/r_segs.c

@@ -681,7 +681,7 @@ static void R_DrawRepeatMaskedColumn(column_t *col)
 {
 	while (sprtopscreen < sprbotscreen) {
 		R_DrawMaskedColumn(col);
-		if ((INT64)sprtopscreen + dc_texheight*spryscale > (INT64)INT32_MAX) // prevent overflow
+		if (sprtopscreen + (INT64)dc_texheight*spryscale > (INT64)INT32_MAX) // prevent overflow
 			sprtopscreen = INT32_MAX;
 		else
 			sprtopscreen += dc_texheight*spryscale;