winex11.drv: Don't modify state if glXMakeContextCurrent fails.

dlls/winex11.drv/opengl.c

@@ -1977,11 +1977,14 @@ BOOL CDECL X11DRV_wglMakeContextCurrentARB(X11DRV_PDEVICE* pDrawDev, X11DRV_PDEV
         if (NULL == pglXMakeContextCurrent) {
             ret = FALSE;
         } else {
-            Wine_GLContext *prev_ctx = NtCurrentTeb()->glContext;
             Wine_GLContext *ctx = (Wine_GLContext *) hglrc;
             Drawable d_draw = get_glxdrawable(pDrawDev);
             Drawable d_read = get_glxdrawable(pReadDev);
 
+            ret = pglXMakeContextCurrent(gdi_display, d_draw, d_read, ctx->ctx);
+            if (ret)
+            {
+                Wine_GLContext *prev_ctx = NtCurrentTeb()->glContext;
                 if (prev_ctx) prev_ctx->tid = 0;
 
                 ctx->has_been_current = TRUE;
@@ -1991,9 +1994,11 @@ BOOL CDECL X11DRV_wglMakeContextCurrentARB(X11DRV_PDEVICE* pDrawDev, X11DRV_PDEV
                 ctx->drawables[0] = d_draw;
                 ctx->drawables[1] = d_read;
                 ctx->refresh_drawables = FALSE;
-            ret = pglXMakeContextCurrent(gdi_display, d_draw, d_read, ctx->ctx);
                 NtCurrentTeb()->glContext = ctx;
             }
+            else
+                SetLastError(ERROR_INVALID_HANDLE);
+        }
     }
     wine_tsx11_unlock();