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/rfkill/rfkill.c b/src/rfkill/rfkill.c
index 0acdf229ed..c0f138b4f4 100644
--- a/src/rfkill/rfkill.c
+++ b/src/rfkill/rfkill.c
@@ -184,9 +184,9 @@ static int determine_state_file(
                 if (!escaped_path_id)
                         return log_oom();
 
-                state_file = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", type, NULL);
+                state_file = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", type);
         } else
-                state_file = strjoin("/var/lib/systemd/rfkill/", type, NULL);
+                state_file = strjoin("/var/lib/systemd/rfkill/", type);
 
         if (!state_file)
                 return log_oom();