tools: fix iterating over argv when recovering xattr

The libvirt_recover_xattrs.sh tool hangs when run. When no flags
are provided OPTIND is 1, so the loop expands to 'shift 0' which
has not effect. Rewrite to just loop over $@ instead which involves
less cleverness.

Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

tools/libvirt_recover_xattrs.sh

@@ -106,9 +106,9 @@ fix_xattrs() {
 
 shift $((OPTIND - 1))
 if [ $# -gt 0 ]; then
-    while [ $# -gt 0 ]; do
-        fix_xattrs "$1"
-        shift $((OPTIND - 1))
+    for arg in "$@"
+    do
+        fix_xattrs "$arg"
     done
 else
     if [ ${UNSAFE} -eq 1 ]; then