tools/tools/zfsboottest doesn't compile on ^/head

[Ngie Cooper]

Hi,
	It looks like zfsboottest no longer compiles on ^/head (guessing it has to do with the clang upgrade).
	If someone doesn’t fix this build breakage in the next few hours, I’ll take a stab at fixing it.
Thanks,
-Ngie

PS zfsboottest should really be compiled with world if MK_ZFS != no.

$ (cd tools/tools/zfsboottest/; make obj; make)
cc  -O1  -I/usr/src/tools/tools/zfsboottest/../../../sys/boot/zfs  -I/usr/src/tools/tools/zfsboottest/../../../sys/cddl/boot/zfs  -I.  -fdiagnostics-show-option  -W -Wextra -Wno-sign-compare -Wno-unused-parameter -m32   -g --coverage -MD  -MF.depend.zfsboottest.o -MTzfsboottest.o -std=gnu99 -fstack-protector-strong    -Qunused-arguments  -c /usr/src/tools/tools/zfsboottest/zfsboottest.c -o zfsboottest.o
In file included from /usr/src/tools/tools/zfsboottest/zfsboottest.c:56:
/usr/src/tools/tools/zfsboottest/../../../sys/boot/zfs/zfsimpl.c:797:9: error: returning 'void' from a function with incompatible result type 'int'
        return (pager_output(line));
               ^~~~~~~~~~~~~~~~~~~~
/usr/src/tools/tools/zfsboottest/../../../sys/boot/zfs/zfsimpl.c:2356:17: warning: array index 264 is past the end of the array (which contains 192 elements) [-Warray-bounds]
                memcpy(path, &dn->dn_bonus[sizeof(znode_phys_t)], psize);
                              ^            ~~~~~~~~~~~~~~~~~~~~
/usr/src/tools/tools/zfsboottest/../../../sys/cddl/boot/zfs/zfsimpl.h:910:2: note: array 'dn_bonus' declared here
        uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)];
        ^
1 warning and 1 error generated.
*** Error code 1

Stop.
make: stopped in /usr/src/tools/tools/zfsboottest

157873        imp void
157873        imp printf(const char *fmt,…)
104679        phk static void printf(const char *,...);