ls: fix segfault-if-standalone-shell, add big fat comment.
diff --git a/archival/libunarchive/get_header_ar.c b/archival/libunarchive/get_header_ar.c
index a8a595e..c691f1b 100644
--- a/archival/libunarchive/get_header_ar.c
+++ b/archival/libunarchive/get_header_ar.c
@@ -66,9 +66,9 @@
/* long filenames have '/' as the first character */
if (ar.formatted.name[0] == '/') {
+#if ENABLE_FEATURE_AR_LONG_FILENAMES
unsigned long_offset;
-#if ENABLE_FEATURE_AR_LONG_FILENAMES
if (ar.formatted.name[1] == '/') {
/* If the second char is a '/' then this entries data section
* stores long filename for multiple entries, they are stored