[MIPS] Remove unreferenced _IOC_SLMASK macro in ioctl.h.

Delete the definition of the apparently unreferenced macro _IOC_SLMASK.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 file changed