rpm2cpio: handle unseekable input correctly

function                                             old     new   delta
data_skip                                             14      20      +6
seek_by_jump                                          67      72      +5
data_align                                            81      84      +3
seek_by_read                                          20      19      -1
skip_header                                           99      94      -5
rpm2cpio_main                                        183     177      -6
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/3 up/down: 14/-12)              Total: 2 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/libunarchive/data_skip.c b/archival/libunarchive/data_skip.c
index 438750f..06d3dce 100644
--- a/archival/libunarchive/data_skip.c
+++ b/archival/libunarchive/data_skip.c
@@ -8,5 +8,5 @@
 
 void FAST_FUNC data_skip(archive_handle_t *archive_handle)
 {
-	archive_handle->seek(archive_handle, archive_handle->file_header->size);
+	archive_handle->seek(archive_handle->src_fd, archive_handle->file_header->size);
 }