From 8c04528fa05ffad4c6072dae9a439c11cdd86393 Mon Sep 17 00:00:00 2001
From: Martin Pulec <martin.pulec@cesnet.cz>
Date: Tue, 4 Jun 2019 10:24:02 +0200
Subject: [PATCH] GL: fixed printing error

---
 src/video_display/gl.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video_display/gl.cpp b/src/video_display/gl.cpp
index e3c0649ce..e368a9101 100644
--- a/src/video_display/gl.cpp
+++ b/src/video_display/gl.cpp
@@ -1023,7 +1023,7 @@ static void glut_init_error_callback(const char *fmt, va_list ap)
         // format the string
         auto buffer = (char *) alloca(size + 1);
         va_copy(aq, ap);
-        if (vsprintf(buffer, fmt, ap) == size) {
+        if (vsprintf(buffer, fmt, ap) >= 0) {
                 LOG(LOG_LEVEL_ERROR) << "[GL] " << buffer << "\n";
         }
         va_end(aq);