tree-wide: drop NULL sentinel from strjoin

This makes strjoin and strjoina more similar and avoids the useless final
argument.

spatch -I . -I ./src -I ./src/basic -I ./src/basic -I ./src/shared -I ./src/shared -I ./src/network -I ./src/locale -I ./src/login -I ./src/journal -I ./src/journal -I ./src/timedate -I ./src/timesync -I ./src/nspawn -I ./src/resolve -I ./src/resolve -I ./src/systemd -I ./src/core -I ./src/core -I ./src/libudev -I ./src/udev -I ./src/udev/net -I ./src/udev -I ./src/libsystemd/sd-bus -I ./src/libsystemd/sd-event -I ./src/libsystemd/sd-login -I ./src/libsystemd/sd-netlink -I ./src/libsystemd/sd-network -I ./src/libsystemd/sd-hwdb -I ./src/libsystemd/sd-device -I ./src/libsystemd/sd-id128 -I ./src/libsystemd-network --sp-file coccinelle/strjoin.cocci --in-place $(git ls-files src/*.c)

git grep -e '\bstrjoin\b.*NULL' -l|xargs sed -i -r 's/strjoin\((.*), NULL\)/strjoin(\1)/'

This might have missed a few cases (spatch has a really hard time dealing
with _cleanup_ macros), but that's no big issue, they can always be fixed
later.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/test/test-fileio.c b/src/test/test-fileio.c
index 92663ef66f..56316904a3 100644
--- a/src/test/test-fileio.c
+++ b/src/test/test-fileio.c
@@ -367,7 +367,7 @@ static void test_write_string_file_verify(void) {
         int r;
 
         assert_se(read_one_line_file("/proc/cmdline", &buf) >= 0);
-        assert_se((buf2 = strjoin(buf, "\n", NULL)));
+        assert_se((buf2 = strjoin(buf, "\n")));
 
         r = write_string_file("/proc/cmdline", buf, 0);
         assert_se(r == -EACCES || r == -EIO);