shared/creds-util: return 0 for missing creds in read_credential_strings_many

Realistically, the only thing that the caller can do is ignore failures related
to missing credentials. If the caller requires some credentials to be present,
they should just check which output variables are not NULL. One of the callers
was already doing that, and the other wanted to, but missed -ENOENT. By
suppressing -ENOENT and -ENXIO, both callers are simplified.

Fixes a warning at boot:
systemd-vconsole-setup[221]: Failed to import credentials, ignoring: No such file or directory

1 files changed, 4 insertions, 4 deletions

diff --git a/src/test/test-creds.c b/src/test/test-creds.c
index 44022e7324..25b0c34a59 100644
--- a/src/test/test-creds.c
+++ b/src/test/test-creds.c
@@ -16,7 +16,7 @@ TEST(read_credential_strings) {
         if (e)
                 assert_se(saved = strdup(e));
 
-        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == -ENXIO);
+        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
         assert_se(x == NULL);
         assert_se(y == NULL);
 
@@ -24,20 +24,20 @@ TEST(read_credential_strings) {
 
         assert_se(setenv("CREDENTIALS_DIRECTORY", tmp, /* override= */ true) >= 0);
 
-        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == -ENOENT);
+        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
         assert_se(x == NULL);
         assert_se(y == NULL);
 
         assert_se(p = path_join(tmp, "bar"));
         assert_se(write_string_file(p, "piff", WRITE_STRING_FILE_CREATE|WRITE_STRING_FILE_AVOID_NEWLINE) >= 0);
 
-        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == -ENOENT);
+        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
         assert_se(x == NULL);
         assert_se(streq(y, "piff"));
 
         assert_se(write_string_file(p, "paff", WRITE_STRING_FILE_TRUNCATE|WRITE_STRING_FILE_AVOID_NEWLINE) >= 0);
 
-        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == -ENOENT);
+        assert_se(read_credential_strings_many("foo", &x, "bar", &y) == 0);
         assert_se(x == NULL);
         assert_se(streq(y, "piff"));