Merge pull request #2357 from keszybz/warnings-2

Remove gcc warnings v2

src/shared/ask-password-api.c

@@ -71,7 +71,7 @@ static int lookup_key(const char *keyname, key_serial_t *ret) {
 
         serial = request_key("user", keyname, NULL, 0);
         if (serial == -1)
-                return -errno;
+                return negative_errno();
 
         *ret = serial;
         return 0;

src/shared/dropin.c

@@ -156,7 +156,7 @@ static int iterate_dir(
 
                 errno = 0;
                 de = readdir(d);
-                if (!de && errno != 0)
+                if (!de && errno > 0)
                         return log_error_errno(errno, "Failed to read directory %s: %m", path);
 
                 if (!de)