change assertion to boolean return in parseUniformBlocks

src/shader.cpp

@@ -638,13 +638,10 @@ parseUniformBlocks(MemoryArena* arena, ShaderProgram* s, GLContext* gl_ctx)
 
 		ub.binding_idx = ctxGetUniformBlockBinding(gl_ctx, ub.name);
 
-		assert(ub.binding_idx >= 0);
-#if 0
 		if (ub.binding_idx < 0)
 			return false;
 
 		glUniformBlockBinding(s->prog_id, i, ub.binding_idx);
-#endif
 	}