treewide: no need to negate errno for log_*_errno()

It corrrectly handles both positive and negative errno values.

src/debug-generator/debug-generator.c

@@ -152,7 +152,7 @@ int main(int argc, char *argv[]) {
 
         r = parse_proc_cmdline(parse_proc_cmdline_item);
         if (r < 0)
-                log_warning_errno(-r, "Failed to parse kernel command line, ignoring: %m");
+                log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 
         if (arg_debug_shell) {
                 r = strv_extend(&arg_wants, "debug-shell.service");