Chase r321920 and r321930 (dev_t being widened)

The layout of st_rdev has changed after this commit, and assumptions made
in the NetBSD tests are no longer valid. Change the hardcoded assumed
values to account for the fact that major/minor are now represented by
64 bits as opposed to the less precise legacy precision of 16 bits.

PR:	221048
Relnotes: st_rdev layout changed; warning about impact of r321920 to
	  downstream consumers

tests/sys/fs/tmpfs/Makefile

@@ -41,7 +41,13 @@ ${PACKAGE}FILESDIR=	${TESTSDIR}
 PROGS+=			h_tools
 BINDIR.h_tools=		${TESTSDIR}
 
+# NOTE: dev_t is represented by 64-bits after r321920 (it was 16-bits
+# previously).
+#
+# The old hardcoded values assume the 16-bit layout for <struct stat>.st_rdev .
 ATF_TESTS_SH_SED_mknod_test=		\
+					-e '/$${st_rdev} -eq 512/s/512/8589934592/g' \
+					-e '/$${st_rdev} -eq 514/s/514/8589934594/g' \
 					-e 's,mknod pipe p,mkfifo pipe,g' \
 					-e 's,mknod dir/pipe p,mkfifo dir/pipe,g'