tpm: Remove superfluous '\n' around error_report()

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/tpm.c b/tpm.c
index 4ffd9b9..963b7ee 100644
--- a/tpm.c
+++ b/tpm.c
@@ -134,7 +134,7 @@
     Error *local_err = NULL;
 
     if (!QLIST_EMPTY(&tpm_backends)) {
-        error_report("Only one TPM is allowed.\n");
+        error_report("Only one TPM is allowed.");
         return 1;
     }