ASoC: wm8753, remove dead code

There is adangling code in wm8753_probe which is never executed.
Remove it.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Liam Girdwood <lg@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>