gl: Properly report error if shader linking fails

In gsk_gl_shader_builder_create_program(), if linking fails we
need to return -1 to indicate error, rather than the old deleted
program id.

diff --git a/gsk/gl/gskglshaderbuilder.c b/gsk/gl/gskglshaderbuilder.c
index a133527784a26de5e03e503367e07e4cb3119cea..66f0a3843e88f0638598ca7ffb458c66f8374445 100644 (file)
--- a/gsk/gl/gskglshaderbuilder.c
+++ b/gsk/gl/gskglshaderbuilder.c
@@ -188,6 +188,7 @@ gsk_gl_shader_builder_create_program (GskGLShaderBuilder  *self,
       g_free (buffer);
 
       glDeleteProgram (program_id);
+      program_id = -1;
 
       goto out;
     }