migration: Fix operator type

Clang spotted an & that should have been an &&; fix it.

Reported by: David Binderman / https://gitlab.com/dcb
Fixes: 65dacaa04f ("migration: introduce save_normal_page()")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/963
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20220406102515.96320-1-dgilbert@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

migration/ram.c

@@ -1291,7 +1291,7 @@ static int save_normal_page(RAMState *rs, RAMBlock *block, ram_addr_t offset,
                                          offset | RAM_SAVE_FLAG_PAGE));
     if (async) {
         qemu_put_buffer_async(rs->f, buf, TARGET_PAGE_SIZE,
-                              migrate_release_ram() &
+                              migrate_release_ram() &&
                               migration_in_postcopy());
     } else {
         qemu_put_buffer(rs->f, buf, TARGET_PAGE_SIZE);