networking: inappropriate ioctl operation should return ENOTTY

ioctl() calls against a socket with an inappropriate ioctl operation
are incorrectly returning EINVAL rather than ENOTTY:

  [ENOTTY]
      Inappropriate I/O control operation.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=33992



Signed-off-by: Lifeng Sun <lifongsun@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>