serial: Samsung: Silence some checkpatch errors and warnings

Fixes the following errors and warnings:
ERROR: trailing whitespace
ERROR: return is not a function, parentheses are not required
WARNING: suspect code indent for conditional statements (32, 36)

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>