FreeBSD/src e099b90 (r314068)sys/amd64/amd64 db_disasm.c pmap.c, sys/boot/common md.c

sys: Replace zero with NULL for pointers.

Found with:     devel/coccinelle
MFC after:      3 weeks
Differential Revision:  https://reviews.freebsd.org/D9694
DeltaFile
+6-6sys/amd64/amd64/db_disasm.c
+3-3sys/boot/zfs/zfsimpl.c
+2-2sys/boot/userboot/userboot/userboot_disk.c
+2-2sys/boot/efi/libefi/efinet.c
+2-2sys/net/iflib.c
+1-1sys/boot/ficl/ficl.c
+1-1sys/boot/kshim/bsd_kernel.c
+1-1sys/boot/ofw/libofw/ofw_memory.c
+1-1sys/boot/sparc64/loader/main.c
+1-1sys/boot/common/md.c
+1-1sys/boot/zfs/zfs.c
+1-1sys/amd64/amd64/pmap.c
+1-1sys/libkern/iconv_xlat16.c
+1-1sys/mips/atheros/ar531x/apb.c
+1-1sys/net/if_fddisubr.c
+1-1sys/net/if_iso88025subr.c
+1-1sys/netpfil/ipfw/ip_fw_sockopt.c
+1-1sys/boot/fdt/fdt_overlay.c
+28-2818 files

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