From 8ab698af15f7d8ae91a750bf5c7b219381ff3587 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Thu, 21 Mar 2019 10:39:49 -0400
Subject: [PATCH] opengles2: Fix static analysis warning.

Not clear if this could ever dereference NULL in real life, but better safe
than sorry!
---
 src/render/opengles2/SDL_render_gles2.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/render/opengles2/SDL_render_gles2.c b/src/render/opengles2/SDL_render_gles2.c
index b77779daa3727..028227f7515bd 100644
--- a/src/render/opengles2/SDL_render_gles2.c
+++ b/src/render/opengles2/SDL_render_gles2.c
@@ -529,8 +529,10 @@ GLES2_CacheProgram(GLES2_RenderData *data, GLES2_ShaderCacheEntry *vertex,
         }
         data->glDeleteProgram(data->program_cache.tail->id);
         data->program_cache.tail = data->program_cache.tail->prev;
-        SDL_free(data->program_cache.tail->next);
-        data->program_cache.tail->next = NULL;
+        if (data->program_cache.tail != NULL) {
+            SDL_free(data->program_cache.tail->next);
+            data->program_cache.tail->next = NULL;
+        }
         --data->program_cache.count;
     }
     return entry;