SDL: Don´t use "trunc" as var name, since it's also a function

SDL Commits
1 
From 161dd83c9a0cb27fb8e954e2a3287c99b0e3bbcf Mon Sep 17 00:00:00 2001
From: Sylvain <[EMAIL REDACTED]>
Date: Mon, 22 Nov 2021 11:15:23 +0100
Subject: [PATCH] =?UTF-8?q?Don=C2=B4t=20use=20"trunc"=20as=20var=20name,?=
 =?UTF-8?q?=20since=20it's=20also=20a=20function?=
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---
 src/render/SDL_render.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/render/SDL_render.c b/src/render/SDL_render.c
index 2b814e78ac..cd8739d03c 100644
--- a/src/render/SDL_render.c
+++ b/src/render/SDL_render.c
@@ -766,15 +766,15 @@ SDL_RendererEventWatch(void *userdata, SDL_Event *event)
                 event->motion.y = (int)(event->motion.y / (scale.y * renderer->dpi_scale.y));
                 if (event->motion.xrel != 0 && renderer->relative_scaling) {
                     float rel = renderer->xrel + event->motion.xrel / (scale.x * renderer->dpi_scale.x);
-                    float trunc = SDL_truncf(rel);
-                    renderer->xrel = rel - trunc;
-                    event->motion.xrel = (Sint32) trunc;
+                    float truncated = SDL_truncf(rel);
+                    renderer->xrel = rel - truncated;
+                    event->motion.xrel = (Sint32) truncated;
                 }
                 if (event->motion.yrel != 0 && renderer->relative_scaling) {
                     float rel = renderer->yrel + event->motion.yrel / (scale.y * renderer->dpi_scale.y);
-                    float trunc = SDL_truncf(rel);
-                    renderer->yrel = rel - trunc;
-                    event->motion.yrel = (Sint32) trunc;
+                    float truncated = SDL_truncf(rel);
+                    renderer->yrel = rel - truncated;
+                    event->motion.yrel = (Sint32) truncated;
                 }
             }
         }