Fix appletalk sysctl entry name

Fix appletalk sysctl entry name

Gabriel C reported that modprobing appletalk on current git gives a
warning in dmesg :

   "sysctl table check failed: /net/appletalk .3.7 procname does not match binary path procname"

Oops.  My apologies it appears I made a mistake when creating my table
to check up on sysctl values.

Signed-off-by: "Eric W. Biederman" <[email protected]>
Tested-by: Gabriel C <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>