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, 2 insertions, 2 deletions

diff --git a/src/core/unit.c b/src/core/unit.c
index 2fa397bd41..14e1d7d20d 100644
--- a/src/core/unit.c
+++ b/src/core/unit.c
@@ -2469,7 +2469,7 @@ int unit_set_default_slice(Unit *u) {
                         return -ENOMEM;
 
                 if (MANAGER_IS_SYSTEM(u->manager))
-                        b = strjoin("system-", escaped, ".slice", NULL);
+                        b = strjoin("system-", escaped, ".slice");
                 else
                         b = strappend(escaped, ".slice");
                 if (!b)
@@ -3629,7 +3629,7 @@ int unit_make_transient(Unit *u) {
         if (!UNIT_VTABLE(u)->can_transient)
                 return -EOPNOTSUPP;
 
-        path = strjoin(u->manager->lookup_paths.transient, "/", u->id, NULL);
+        path = strjoin(u->manager->lookup_paths.transient, "/", u->id);
         if (!path)
                 return -ENOMEM;