md/raid0: remove empty line printk from dump_zones

Remove the final printk. All preceding output is already properly
newline-terminated and the printk isn't even KERN_CONT to begin with,
so it only adds one empty line to the log.

Signed-off-by: Michal Pecio <michal.pecio@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>