Fix problem in ftp and case mapping mode where the converted string wasn't

terminated properly.  Fix is from the PR and works for the test cases I
threw at it.  Should be safe and desirable for back porting to 2.2 or
earlier if there are people still comitting to -stable.

Submitted by:	Marc Slemko <marcs@znep.com>
Closes PR:	1864

usr.bin/ftp/cmds.c

@@ -742,6 +742,7 @@ mget(argc, argv)
 			if (mcase) {
 				for (tp2 = tmpbuf; ch = *tp++;)
 					*tp2++ = isupper(ch) ? tolower(ch) : ch;
+				*tp2 = '\0';
 				tp = tmpbuf;
 			}
 			if (ntflag) {