egl: Move an error check earlier in EGL_BUFFER_AGE_EXT query

I can't think of any good reason to call down to the driver and _then_
check whether your calling context was already bad.

Reviewed-by: Eric Engestrom <eric@igalia.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18214>

src/egl/main/eglsurface.c

@@ -559,14 +559,14 @@ _eglQuerySurface(_EGLDisplay *disp, _EGLSurface *surface,
          return _eglError(EGL_BAD_ATTRIBUTE, "eglQuerySurface");
 
       _EGLContext *ctx = _eglGetCurrentContext();
-      EGLint result = disp->Driver->QueryBufferAge(disp, surface);
-      /* error happened */
-      if (result < 0)
-         return EGL_FALSE;
       if (_eglGetContextHandle(ctx) == EGL_NO_CONTEXT ||
           ctx->DrawSurface != surface)
          return _eglError(EGL_BAD_SURFACE, "eglQuerySurface");
 
+      EGLint result = disp->Driver->QueryBufferAge(disp, surface);
+      if (result < 0)
+         return EGL_FALSE;
+
       *value = result;
       surface->BufferAgeRead = EGL_TRUE;
       break;