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/basic/unit-name.c b/src/basic/unit-name.c
index fe883b95c7..0a6efa449a 100644
--- a/src/basic/unit-name.c
+++ b/src/basic/unit-name.c
@@ -273,7 +273,7 @@ int unit_name_build(const char *prefix, const char *instance, const char *suffix
         if (!instance)
                 s = strappend(prefix, suffix);
         else
-                s = strjoin(prefix, "@", instance, suffix, NULL);
+                s = strjoin(prefix, "@", instance, suffix);
         if (!s)
                 return -ENOMEM;
 
@@ -554,7 +554,7 @@ int unit_name_from_path_instance(const char *prefix, const char *path, const cha
         if (r < 0)
                 return r;
 
-        s = strjoin(prefix, "@", p, suffix, NULL);
+        s = strjoin(prefix, "@", p, suffix);
         if (!s)
                 return -ENOMEM;