bankd: Don't log an "Error" if slotmap is removed

removing a slotmap and the related client disconnect are perfectly
normal operation. Don't print the word Error in the log in such cases,
it just confuses the user.

Closes: OS#5629
Change-Id: Ie39d35fd348fdf3dd53c860dc830aac794a3ead5
diff --git a/src/bankd/bankd_main.c b/src/bankd/bankd_main.c
index c2d6e69..b3b8dff 100644
--- a/src/bankd/bankd_main.c
+++ b/src/bankd/bankd_main.c
@@ -986,7 +986,10 @@
 				break;
 		}
 
-		LOGW(g_worker, "Error %d occurred: Cleaning up state\n", rc);
+		if (rc == -23)
+			LOGW(g_worker, "Client unmapped: Cleaning up state\n");
+		else
+			LOGW(g_worker, "Error %d occurred: Cleaning up state\n", rc);
 
 		/* clean-up: reset to sane state */
 		memset(&g_worker->card, 0, sizeof(g_worker->card));