migration: fix hardcoded function name in error report

Reviewed-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NAlexey Perevalov <a.perevalov@samsung.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

migration/postcopy-ram.c

@@ -69,7 +69,7 @@ static bool ufd_version_check(int ufd, MigrationIncomingState *mis)
     api_struct.api = UFFD_API;
     api_struct.features = 0;
     if (ioctl(ufd, UFFDIO_API, &api_struct)) {
-        error_report("postcopy_ram_supported_by_host: UFFDIO_API failed: %s",
+        error_report("%s: UFFDIO_API failed: %s", __func__,
                      strerror(errno));
         return false;
     }