Build failure after recent ipf import

[Paul Goyette <paul%whooppee.com@localhost>]

This is on port amd64:

#   compile  ippool/ippool.o
/build/netbsd-local/tools/x86_64/amd64/bin/x86_64--netbsd-gcc -O2  
-fstack-protector -Wstack-protector --param ssp-buffer-size=1 -Wall 
-Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wno-sign-compare 
-Wno-traditional -Wa,--fatal-warnings  -Werror   -I. 
-I/build/netbsd-local/src/dist/ipf -I/build/netbsd-local/src/dist/ipf/tools 
-I/build/netbsd-local/src/sys -I/build/netbsd-local/src/sys/dist/ipf 
-I/build/netbsd-local/src/sys/dist/ipf/netinet -DSTATETOP -D__UIO_EXPOSE -DINET 
-DINET6 -nostdinc -isystem /build/netbsd-local/dest/amd64/usr/include   
-D_FORTIFY_SOURCE=2 -c    /build/netbsd-local/src/dist/ipf/tools/ippool.c
cc1: warnings being treated as errors
/build/netbsd-local/src/dist/ipf/tools/ippool.c: In function 'poolflush':
/build/netbsd-local/src/dist/ipf/tools/ippool.c:503: warning: format '%zu' 
expects type 'size_t', but argument 2 has type 'u_int'
/build/netbsd-local/src/dist/ipf/tools/ippool.c:503: warning: format '%zu' 
expects type 'size_t', but argument 2 has type 'u_int'


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