xsm: apply coding style

xsm: apply coding style

Instead of intermixing coding style changes with code changes as they
are come upon in this patch set, moving all coding style changes
into a single commit. The focus of coding style changes here are,

 - move trailing comments to line above
 - ensuring line length does not exceed 80 chars
 - ensuring proper indentation for 80 char wrapping
 - covert u32 type statements to  uint32_t
 - remove space between closing and opening parens
 - drop extern on function declarations

Signed-off-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Acked-by: Jan Beulich <jbeulich@suse.com>