treewide: use log_*_errno whenever %m is in the format string

If the format string contains %m, clearly errno must have a meaningful
value, so we might as well use log_*_errno to have ERRNO= logged.

Using:
find . -name '*.[ch]' | xargs sed -r -i -e \
's/log_(debug|info|notice|warning|error|emergency)\((".*%m.*")/log_\1_errno(errno, \2/'

Plus some whitespace, linewrap, and indent adjustments.

src/initctl/initctl.c

@@ -162,7 +162,7 @@ static void request_process(Server *s, const struct init_request *req) {
                         case 'u':
                         case 'U':
                                 if (kill(1, SIGTERM) < 0)
-                                        log_error("kill() failed: %m");
+                                        log_error_errno(errno, "kill() failed: %m");
 
                                 /* The bus connection will be
                                  * terminated if PID 1 is reexecuted,
@@ -175,7 +175,7 @@ static void request_process(Server *s, const struct init_request *req) {
                         case 'q':
                         case 'Q':
                                 if (kill(1, SIGHUP) < 0)
-                                        log_error("kill() failed: %m");
+                                        log_error_errno(errno, "kill() failed: %m");
                                 break;
 
                         default:
@@ -217,7 +217,7 @@ static int fifo_process(Fifo *f) {
                 if (errno == EAGAIN)
                         return 0;
 
-                log_warning("Failed to read from fifo: %m");
+                log_warning_errno(errno, "Failed to read from fifo: %m");
                 return -errno;
         }
 
@@ -277,7 +277,7 @@ static int server_init(Server *s, unsigned n_sockets) {
         s->epoll_fd = epoll_create1(EPOLL_CLOEXEC);
         if (s->epoll_fd < 0) {
                 r = -errno;
-                log_error("Failed to create epoll object: %m");
+                log_error_errno(errno, "Failed to create epoll object: %m");
                 goto fail;
         }
 
@@ -303,7 +303,7 @@ static int server_init(Server *s, unsigned n_sockets) {
                 f = new0(Fifo, 1);
                 if (!f) {
                         r = -ENOMEM;
-                        log_error("Failed to create fifo object: %m");
+                        log_error_errno(errno, "Failed to create fifo object: %m");
                         goto fail;
                 }
 
@@ -315,7 +315,7 @@ static int server_init(Server *s, unsigned n_sockets) {
                 if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
                         r = -errno;
                         fifo_free(f);
-                        log_error("Failed to add fifo fd to epoll object: %m");
+                        log_error_errno(errno, "Failed to add fifo fd to epoll object: %m");
                         goto fail;
                 }
 
@@ -413,7 +413,7 @@ int main(int argc, char *argv[]) {
                         if (errno == EINTR)
                                 continue;
 
-                        log_error("epoll_wait() failed: %m");
+                        log_error_errno(errno, "epoll_wait() failed: %m");
                         goto fail;
                 }