tcpdump: use unsigned char in isprint

[Martin Vahlensieck]

Hi

I think this is the way it was meant.

Best,

Martin

Index: util.c
===================================================================
RCS file: /cvs/src/usr.sbin/tcpdump/util.c,v
retrieving revision 1.30
diff -u -p -r1.30 util.c
--- util.c      24 Jan 2020 22:46:37 -0000      1.30
+++ util.c      29 Nov 2020 21:23:37 -0000
@@ -306,7 +306,7 @@ safeputchar(int c)
        unsigned char ch;
 
        ch = (unsigned char)(c & 0xff);
-       if (c < 0x80 && isprint(c))
+       if (ch < 0x80 && isprint(ch))
                printf("%c", c & 0xff);
        else
                printf("\\%03o", c & 0xff);