util-lib: split out printf() helpers to stdio-util.h

src/shared/bus-util.c

@@ -43,6 +43,7 @@
 #include "rlimit-util.h"
 #include "set.h"
 #include "signal-util.h"
+#include "stdio-util.h"
 #include "string-util.h"
 #include "strv.h"
 #include "syslog-util.h"

src/shared/efivars.c

@@ -28,6 +28,7 @@
 #include "fd-util.h"
 #include "io-util.h"
 #include "parse-util.h"
+#include "stdio-util.h"
 #include "utf8.h"
 #include "util.h"
 #include "virt.h"

src/shared/spawn-polkit-agent.c

@@ -30,6 +30,7 @@
 #include "log.h"
 #include "process-util.h"
 #include "spawn-polkit-agent.h"
+#include "stdio-util.h"
 #include "util.h"
 
 #ifdef ENABLE_POLKIT
@@ -78,8 +79,9 @@ void polkit_agent_close(void) {
                 return;
 
         /* Inform agent that we are done */
-        kill(agent_pid, SIGTERM);
-        kill(agent_pid, SIGCONT);
+        (void) kill(agent_pid, SIGTERM);
+        (void) kill(agent_pid, SIGCONT);
+
         (void) wait_for_terminate(agent_pid, NULL);
         agent_pid = 0;
 }