sysctl: correct comment in xen_sysctl_pcitopoinfo

Refer to correct member of struct xen_sysctl_pcitopoinfo in comment.

Fixes: commit 61319fbfd9 ("sysctl: add sysctl interface for querying PCI topology")

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/include/public/sysctl.h

@@ -684,7 +684,7 @@ struct xen_sysctl_psr_cmt_op {
 #define XEN_INVALID_DEV (XEN_INVALID_NODE_ID - 1)
 struct xen_sysctl_pcitopoinfo {
     /*
-     * IN: Number of elements in 'pcitopo' and 'nodes' arrays.
+     * IN: Number of elements in 'devs' and 'nodes' arrays.
      * OUT: Number of processed elements of those arrays.
      */
     uint32_t num_devs;