st/dri: check pipe_screen->resource_get_handle() return value

st/dri: check pipe_screen->resource_get_handle() return value

Change dri2_query_image to check the return value of resource_get_handle
and return GL_FALSE if an error occurs.

For reference this is an example callstack that should propagate the
error back to the user:

    i915_drm_buffer_get_handle
    i915_texture_get_handle
    u_resource_get_handle_vtbl
    dri2_query_image
    gbm_dri_bo_get_fd
    gbm_bo_get_fd

Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Nicholas Bishop <nbishop@neverware.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> (v1)
[Emil Velikov: Split from larger patch, polish coding style, cc stable]
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>