(mget): cast char to unsigned char to make sure its not negative when

passing it to tolower


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14814 ec53bebd-3082-4978-b11e-865c3cabbd6b

appl/ftp/ftp/cmds.c

@@ -737,7 +737,7 @@ mget(int argc, char **argv)
 		if (mflag && confirm(argv[0], cp)) {
 			tp = cp;
 			if (mcase) {
-				for (tp2 = tmpbuf; (ch = *tp++);)
+				for (tp2 = tmpbuf;(ch = (unsigned char)*tp++);)
 					*tp2++ = tolower(ch);
 				*tp2 = '\0';
 				tp = tmpbuf;