module: return error when mod_sysfs_init() failed

load_module() returns zero when mod_sysfs_init() fails, then the module
loading will succeed accidentally.

This patch makes load_module() return error correctly in that case.

Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>