input: ft5x06_ts: clean up the focaltech touchscreen driver

Clean up the focaltech driver by fixing the following checkpatch
errors.

1. else is not generally useful after a break or return
2. Possible unnecessary 'out of memory' message
3. Using __devexit is unnecessary
4. Unnecessary space before function pointer arguments

This patch is a propagated patch from 3.18 kernel
'commit 2b6ea311a968 ("input: ft5x06_ts: fix checkpatch errors")'

Change-Id: I36ed0497c12b0f14e9d7b60c2d8e78729871b8d0
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>
Signed-off-by: Abinaya P <abinayap@codeaurora.org>