tests/.gitignore: Ignore test-char

[Lin Ma <lma@suse.com> notes that commit ea3af47 added test for chardev
unit tests, but didn't add the name of generated binary in .gitignore.
--Stefan]

Signed-off-by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 1478494765-13233-1-git-send-email-xiecl.fnst@cn.fujitsu.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

tests/.gitignore

@@ -16,6 +16,7 @@ test-bitops
 test-blockjob
 test-blockjob-txn
 test-bufferiszero
+test-char
 test-clone-visitor
 test-coroutine
 test-crypto-afsplit