loaders: BMP: Implement BGR888 Save.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
backends: Linux FB: Fix error codepath.

Correctly uninitialize keyboard and console on failure.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
loaders: ZIP: Silence unused warning.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>