treewide: yet more log_*_errno + return simplifications

Using:
find . -name '*.[ch]' | while read f; do perl -i.mmm -e \
 'local $/;
  local $_=<>;
  s/(if\s*\([^\n]+\))\s*{\n(\s*)(log_[a-z_]*_errno\(\s*([->a-zA-Z_]+)\s*,[^;]+);\s*return\s+\g4;\s+}/\1\n\2return \3;/msg;
  print;'
 $f
done

And a couple of manual whitespace fixups.

src/libsystemd/sd-bus/test-bus-chat.c

@@ -53,10 +53,8 @@ static int object_callback(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bu
                 log_info("Invoked Foobar() on %s", sd_bus_message_get_path(m));
 
                 r = sd_bus_reply_method_return(m, NULL);
-                if (r < 0) {
-                        log_error_errno(r, "Failed to send reply: %m");
-                        return r;
-                }
+                if (r < 0)
+                        return log_error_errno(r, "Failed to send reply: %m");
 
                 return 1;
         }

src/libsystemd/sd-bus/test-bus-server.c

@@ -146,10 +146,8 @@ static int client(struct context *c) {
                         "/",
                         "org.freedesktop.systemd.test",
                         "Exit");
-        if (r < 0) {
-                log_error_errno(r, "Failed to allocate method call: %m");
-                return r;
-        }
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate method call: %m");
 
         r = sd_bus_call(bus, m, 0, &error, &reply);
         if (r < 0) {