examples/vhost: fix free function mismatch

The pointer bdev is allocated with rte_zmalloc() and then
incorrectly freed with free() which will lead to pool corruption.

Bugzilla ID: 1553
Fixes: c19beb3 ("examples/vhost_blk: introduce vhost storage sample")
Cc: [email protected]

Signed-off-by: Stephen Hemminger <[email protected]>
Acked-by: Chengwen Feng <[email protected]>
Reviewed-by: Chenbo Xia <[email protected]>
Acked-by: Morten Brørup <[email protected]>
Acked-by: Konstantin Ananyev <[email protected]>
Acked-by: Wathsala Vithanage <[email protected]>

Author: shemminger

examples/vhost_blk/vhost_blk.c

@@ -776,7 +776,7 @@ vhost_blk_bdev_construct(const char *bdev_name,
 	bdev->data = rte_zmalloc(NULL, blk_cnt * blk_size, 0);
 	if (!bdev->data) {
 		fprintf(stderr, "No enough reserved huge memory for disk\n");
-		free(bdev);
+		rte_free(bdev);
 		return NULL;
 	}