In sys/compat/linux/linux_ioctl.c, work around a warning when a pointer is compared to an integer, by casting the pointer to l_uintptr_t.  No functional difference on both i386 and amd64.
In sys/compat/linux/linux_ioctl.c, work around a warning when a pointer
is compared to an integer, by casting the pointer to l_uintptr_t.  No
functional difference on both i386 and amd64.

Reviewed by:	ed, jhb
MFC after:	1 week

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