r279514: buildworld failure: /usr/src/lib/libnv/tests/dnv_tests.cc:453:2: error: use of overloaded operator '<<' is ambiguous

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Buildworld fails in CURRENT r279514 with the following error:

[...]

- --- sbin.all__D ---
- --- camcontrol.o ---
cc  -O2 -pipe -O3 -O3 -pipe -march=native  -std=gnu99 -fstack-protector
- -Wsystem-headers -Werror -Wall -Wno-format-y2k -W -Wno-unused-parameter
- -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Wreturn-type
- -Wcast-qual -Wwrite-strings -Wswitch -Wshadow -Wunused-parameter -Wcast-align
- -Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls
- -Wold-style-definition -Wno-pointer-sign -Wmissing-variable-declarations
- -Wthread-safety -Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable
- -Qunused-arguments -c /usr/src/sbin/camcontrol/camcontrol.c --- gnu.all__D
- --- /usr/src/gnu/usr.bin/rcs/lib/rcsrev.c:750:8: warning: add explicit braces
to avoid dangling else [-Wdangling-else] else { ^ --- lib.all__D
- --- /usr/src/lib/libnv/tests/dnv_tests.cc:453:2: error: use of overloaded
operator '<<' is ambiguous (with operand types 'basic_ostream<char,
std::__1::char_traits<char> >' and 'nullptr_t') ATF_REQUIRE_EQ(actual_val,
NULL); --- kerberos5.all__D
- --- /usr/src/kerberos5/usr.bin/ksu/../../../crypto/heimdal/appl/su/su.c:437:42:
warning: data argument not used by format string [-Wformat-extra-args] ---
lib.all__D ---
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/obj/usr/src/tmp/usr/include/atf-c++/macros.hpp:114:53:
note: expanded from macro 'ATF_REQUIRE_EQ' << " (" << (expected) << " != " <<
(actual) << ")"; \ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~~~~~~~~
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