more: fix file descriptor leak

more: fix file descriptor leak

When you view a file with the more command and run a shell, the file descriptor
for reading the file is leaked to that process.

To test, more any file. Then do !/bin/sh. At the prompt do "ls -l /proc/$$/fd"
and you'll see the leaked fd.

From: Steve Grubb <sgrubb@redhat.com>
Signed-off-by: Karel Zak <kzak@redhat.com>