SDL: Revert "Fix relative mouse input for Unvanquished (unvanquished.net)"

SDL Commits
#1 
From fa073ed01aff3b0fe32edfccd4806a311c8ea214 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 22 Apr 2022 22:31:04 -0700
Subject: [PATCH] Revert "Fix relative mouse input for Unvanquished
 (unvanquished.net)"

This reverts commit 331859079674465a39b24f32a6a113959601dca3.

Fixes https://github.com/libsdl-org/SDL/issues/5569
---
 src/events/SDL_mouse.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/events/SDL_mouse.c b/src/events/SDL_mouse.c
index 735991f75d6..254182cc5ac 100644
--- a/src/events/SDL_mouse.c
+++ b/src/events/SDL_mouse.c
@@ -410,7 +410,6 @@ SDL_PrivateSendMouseMotion(SDL_Window * window, SDL_MouseID mouseID, int relativ
         mouse->x = x;
         mouse->y = y;
         mouse->has_position = SDL_TRUE;
-        return 0;
     } else if (!xrel && !yrel) {  /* Drop events that don't change state */
 #ifdef DEBUG_MOUSE
         SDL_Log("Mouse event didn't change state - dropped!\n");