sdl12-compat: SDL_UpperBlit: remove Rect20to12 for srcrect,

SDL Commits
1 
From 990b68c4d59735c025db2823e0cb145d99d3bd3e Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 1 Mar 2021 20:56:10 +0300
Subject: [PATCH] SDL_UpperBlit: remove Rect20to12 for srcrect,

srcrect is a const ptr, so no need converting it back to SDL-1.2 format
after SDL20_UpperBlit returns.
---
 src/SDL12_compat.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index a905710..7bd1e62 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -3330,10 +3330,6 @@ SDL_UpperBlit(SDL12_Surface *src12, SDL12_Rect *srcrect12, SDL12_Surface *dst12,
 
     RestoreDestAlpha(dst12, dstalpha);
 
-    if (srcrect12) {
-        Rect20to12(&srcrect20, srcrect12);
-    }
-
     if (dstrect12) {
         Rect20to12(&dstrect20, dstrect12);
     }