s390/cpum_sf: Fix line length and format string

Rewrite some lines to match line length and replace
format string 0x%x to %#x.  Add and remove blank line.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>