From 9312e0fd1e162094ba2470408878879fa24eeaf7 Mon Sep 17 00:00:00 2001
From: "Adam D. Moss" <c@yotes.com>
Date: Sat, 20 Feb 2021 20:23:10 -0800
Subject: [PATCH] Fix error message when zfs module are already unloaded

Using zfs-sh -u on linux will fail with inaccurate message when the
zfs modules are already unloaded.  Deal with the case where a module
is already unloaded; its USE_COUNT will be the empty string

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Adam Moss <c@yotes.com>
Closes #11627
---
 scripts/zfs.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/zfs.sh b/scripts/zfs.sh
index c131429c91..2f5f3f8fdb 100755
--- a/scripts/zfs.sh
+++ b/scripts/zfs.sh
@@ -198,7 +198,7 @@ unload_modules_linux() {
 
 		if [ "$USE_COUNT" = "0" ] ; then
 			unload_module_linux "$KMOD" || return 1
-		else
+		elif [ "$USE_COUNT" != "" ] ; then
 			echo "Module ${NAME} is still in use!"
 			return 1
 		fi