cpio: internalize archive_xread_all_eof. add a few paranoia checks

 for corrupted cpio files.
modprobe-small: remove stray include
route: small code shrink

function                                             old     new   delta
get_header_cpio                                      958     980     +22
archive_xread_all_eof                                 33       -     -33
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/0 up/down: 22/-33)            Total: -11 bytes

1 files changed, 0 insertions, 20 deletions

diff --git a/archival/libunarchive/archive_xread_all_eof.c b/archival/libunarchive/archive_xread_all_eof.c
deleted file mode 100644
index f11a7fd32..000000000
--- a/archival/libunarchive/archive_xread_all_eof.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/* vi: set sw=4 ts=4: */
-/*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- */
-
-#include "libbb.h"
-#include "unarchive.h"
-
-ssize_t FAST_FUNC archive_xread_all_eof(archive_handle_t *archive_handle,
-			unsigned char *buf, size_t count)
-{
-	ssize_t size;
-
-	size = full_read(archive_handle->src_fd, buf, count);
-	if (size != 0 && size != (ssize_t)count) {
-		bb_error_msg_and_die("short read: %u of %u",
-				(unsigned)size, (unsigned)count);
-	}
-	return size;
-}