qht: simplify qht_reset_size

qht: simplify qht_reset_size

Sometimes gcc doesn't pick up the fact that 'new' is properly
set if 'resize == true', which may generate an unnecessary
build warning.

Fix it by removing 'resize' and directly checking that 'new'
is non-NULL.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1475706880-10667-2-git-send-email-cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit f555a9d0b3c785b698f32e6879e97d0a4b387314)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>