db_sms_test: Do not print exact memcmp result

man memcp doesn't define exact values for returned integer, it only
specifices a meaning for the sign of it.
So it happens that different versions/implementations actually return
different values when this test is run, making it fail.
Let's simply drop that info from logs since anyways it's not useful.

Change-Id: I771fb8f4fc56f337b16561d005ff1803a386d1c6
diff --git a/tests/db_sms/db_sms_test.c b/tests/db_sms/db_sms_test.c
index a97f7c7..24c86e5 100644
--- a/tests/db_sms/db_sms_test.c
+++ b/tests/db_sms/db_sms_test.c
@@ -357,16 +357,14 @@
 	rc = memcmp(sms->user_data, test->sms.user_data,
                     sizeof(sms->user_data));
 	if (rc) {
-		LOGPC(DDB, LOGL_ERROR, "TP-User-Data mismatch (diff=%d/%zu)\n",
-		      rc, sizeof(sms->user_data));
+		LOGPC(DDB, LOGL_ERROR, "TP-User-Data mismatch\n");
 		return -EINVAL;
 	}
 
 	/* Compare decoded text */
 	rc = strncmp(sms->text, test->sms.text, sizeof(sms->text));
 	if (rc) {
-		LOGPC(DDB, LOGL_ERROR, "TP-User-Data (text) mismatch (diff=%d/%zu)\n",
-		      rc, sizeof(sms->text));
+		LOGPC(DDB, LOGL_ERROR, "TP-User-Data (text) mismatch\n");
 		return -EINVAL;
 	}