missing printk loglevel and tiny tiny whitespace change in binfmt_elf()

Patch adds a mising printk loglevel (I think KERN_WARNING is appropriate
here) in fs/binfmt_elf.c, and while I was there I made some tiny tiny tiny
adjustments to whitespacing in the neighborhood.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Adrian Bunk <bunk@stusta.de>