import-creds: when we hit ENOENT on SMBIOS 11 do not even debug log

We'll *always* hit ENEOENT when iterating through SMBIOS type #11
fields, on the last one. it's very confusing to debug log about that,
let's just not do it.

(cherry picked from commit 5202ee4)
(cherry picked from commit 995c702)
(cherry picked from commit f084959)
(cherry picked from commit b5f3e79)
(cherry picked from commit 62f8196)

Author: poettering

src/core/import-creds.c

@@ -585,9 +585,11 @@ static int import_credentials_smbios(ImportCredentialContext *c) {
                         return log_oom();
 
                 r = read_virtual_file(p, sizeof(dmi_field_header) + CREDENTIALS_TOTAL_SIZE_MAX, (char**) &data, &size);
+                if (r == -ENOENT) /* Once we reach ENOENT there are no more DMI Type 11 fields around. */
+                        break;
                 if (r < 0) {
                         /* Once we reach ENOENT there are no more DMI Type 11 fields around. */
-                        log_full_errno(r == -ENOENT ? LOG_DEBUG : LOG_WARNING, r, "Failed to open '%s', ignoring: %m", p);
+                        log_warning_errno(r, "Failed to open '%s', ignoring: %m", p);
                         break;
                 }