Cast isspace() arg to unsigned char

[Michael McConville]

ok?


Index: fio.c
===================================================================
RCS file: /cvs/src/usr.bin/mail/fio.c,v
retrieving revision 1.35
diff -u -p -r1.35 fio.c
--- fio.c       16 Oct 2015 17:56:07 -0000      1.35
+++ fio.c       16 Oct 2015 17:56:42 -0000
@@ -142,7 +142,7 @@ setptr(FILE *ibuf, off_t offset)
                } else if (inhead) {
                        for (cp = linebuf, cp2 = "status";; cp++) {
                                if ((c = (unsigned char)*cp2++) == 0) {
-                                       while (isspace(*cp++))
+                                       while (isspace((unsigned char)*cp++))
                                                ;
                                        if (cp[-1] != ':')
                                                break;