Stop gcc4 from nit-picking about signedness of char *.
diff --git a/archival/libunarchive/decompress_bunzip2.c b/archival/libunarchive/decompress_bunzip2.c
index 07e3cf0..597ec85 100644
--- a/archival/libunarchive/decompress_bunzip2.c
+++ b/archival/libunarchive/decompress_bunzip2.c
@@ -514,7 +514,8 @@
/* Allocate the structure, read file header. If in_fd==-1, inbuf must contain
a complete bunzip file (len bytes long). If in_fd!=-1, inbuf and len are
ignored, and data is read from file handle into temporary buffer. */
-static int start_bunzip(bunzip_data **bdp, int in_fd, char *inbuf, int len)
+static int start_bunzip(bunzip_data **bdp, int in_fd, unsigned char *inbuf,
+ int len)
{
bunzip_data *bd;
unsigned int i,j,c;