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/path/path.c

@@ -108,10 +108,8 @@ static int print_home(const char *n) {
                         _cleanup_free_ char *p = NULL;
 
                         r = sd_path_home(i, arg_suffix, &p);
-                        if (r < 0) {
-                                log_error_errno(r, "Failed to query %s: %m", n);
-                                return r;
-                        }
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to query %s: %m", n);
 
                         printf("%s\n", p);
                         return 0;