x86/vdso: Convert use of typedef ctl_table to struct ctl_table

This typedef is unnecessary and should just be removed.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Jiri Kosina <trivial@kernel.org>
Link: http://lkml.kernel.org/r/a756fa0060e8eea25e8c1863c2764e86c2823617.1371177118.git.joe@perches.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>