Staging: xgifb: fixed many style issue in vb_ext.c

This is a patch to the vb_ext.c file that fixes many style
issues found by the checkpatch.pl tool.
- extra spaces
- invalid code indent
- extra braces
- invalid comment style

Signed-off-by: Prashant P. Shah <pshah.mumbai@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>