(Finsert_file_contents): Fix char signedness mismatches.

diff --git a/src/fileio.c b/src/fileio.c
index 5814e27..8aa8703 100644 (file)
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3767,7 +3767,7 @@ This does code conversion according to the value of\n\
        {
          /* try is reserved in some compilers (Microsoft C) */
          int trytry = min (total - how_much, READ_BUF_SIZE - unprocessed);
-         char *destination = read_buf + unprocessed;
+         unsigned char *destination = read_buf + unprocessed;
          int this;
 
          /* Allow quitting out of the actual I/O.  */