ZTS: Fix skipping over comment lines in zpool_create.shlib

In zpool_create.shlib, check_feature_set iterates over all features
mentioned in provided compatibility file to check if only those
features are enabled on the pool.

This commit fixes skipping over comment lines correctly. Otherwise,
the test case fails as comment lines are also treated as feature names
by check_feature_set function.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Alexander Motin <[email protected]>
Signed-off-by: Umer Saleem <[email protected]>
Closes openzfs#15909

Author: Umer Saleem

tests/zfs-tests/tests/functional/cli_root/zpool_create/zpool_create.shlib

@@ -119,9 +119,8 @@ function check_feature_set
 	while read line; do
 		typeset flag=1
 
-		if [[ "$line" == "#*" ]]; then
-			continue
-		fi
+		# Skip comments
+		[[ $line = \#* ]] && continue
 
 		for set in "$@"; do
 			if ! grep -q "$line" $ZPOOL_COMPAT_DIR/$set; then