serial: samsung: Minor whitespace cleanups

Make the code slightly more readable by removing unneeded line breaks,
adding missing line breaks and white spaces.  This also fixes few strict
checkpatch suggestions:

	CHECK: spaces preferred around that '-' (ctx:VxV)
	CHECK: Unbalanced braces around else statement
	CHECK: Lines should not end with a '('

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200617152856.18086-1-krzk@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>