softpipe: Free tgsi.image elements on context destruction.

Courtesy of address sanitizer.

[airlied: free buffers as well]
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/drivers/softpipe/sp_context.c

@@ -117,6 +117,8 @@ softpipe_destroy( struct pipe_context *pipe )
 
    for (i = 0; i < PIPE_SHADER_TYPES; i++) {
       FREE(softpipe->tgsi.sampler[i]);
+      FREE(softpipe->tgsi.image[i]);
+      FREE(softpipe->tgsi.buffer[i]);
    }
 
    FREE( softpipe );