ASoC: core: fix tailing whitespace in soc_pcm_apply_symmetry

My editor removes the tailing spaces, which causes problems when
changing the soc-core.c
Removing the space.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>