um_mount did nothing but turn around and call sys_mount with the same
arguments.  This makes it useless code, and it has been duly removed.
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>