patch 8.1.1630: various small problems

Problem:    Various small problems.
Solution:   Various small improvements.
diff --git a/src/message.c b/src/message.c
index 26a3e3a..c5e73ba 100644
--- a/src/message.c
+++ b/src/message.c
@@ -652,7 +652,7 @@
 		redir_write(s, -1);
 	    }
 #ifdef FEAT_JOB_CHANNEL
-	    ch_log(NULL, "ERROR: %s", (char *)s);
+	    ch_log(NULL, "ERROR silent: %s", (char *)s);
 #endif
 	    return TRUE;
 	}