block: Remove unnecessary NULL check in bdrv_pad_request()

Coverity complains that the check introduced in commit 3f93481 suggests
that qiov could be NULL and we dereference it before reaching the check.
In fact, all of the callers pass a non-NULL pointer, so just remove the
misleading check.

Resolves: Coverity CID 1542668
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Fiona Ebner <f.ebner@proxmox.com>
Message-ID: <20240327192750.204197-1-kwolf@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Author: kevmw

block/io.c

@@ -1730,7 +1730,7 @@ static int bdrv_pad_request(BlockDriverState *bs,
      * For prefetching in stream_populate(), no qiov is passed along, because
      * only copy-on-read matters.
      */
-    if (qiov && *qiov) {
+    if (*qiov) {
         sliced_iov = qemu_iovec_slice(*qiov, *qiov_offset, *bytes,
                                       &sliced_head, &sliced_tail,
                                       &sliced_niov);