egl/x11: Fix leak in dri3_create_image_khr_pixmap

bp_reply wasn't properly free'd

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>

src/egl/drivers/dri2/platform_x11_dri3.c

@@ -285,6 +285,7 @@ dri3_create_image_khr_pixmap(_EGLDisplay *disp, _EGLContext *ctx,
    dri2_img = malloc(sizeof *dri2_img);
    if (!dri2_img) {
       _eglError(EGL_BAD_ALLOC, "dri3_create_image_khr");
+      free(bp_reply);
       return EGL_NO_IMAGE_KHR;
    }