[PATCH] drivers/pci: Add minor comment for maximum capability constant

[Frediano Ziglio <frediano.ziglio@xxxxxxxxx>]

The comment is similar to extended capabilities in the function
below.

Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxx>
---
 xen/drivers/pci/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/drivers/pci/pci.c b/xen/drivers/pci/pci.c
index acf4cebe42..e1ddde90eb 100644
--- a/xen/drivers/pci/pci.c
+++ b/xen/drivers/pci/pci.c
@@ -11,7 +11,7 @@
 unsigned int pci_find_cap_offset(pci_sbdf_t sbdf, unsigned int cap)
 {
     u8 id;
-    int max_cap = 48;
+    int max_cap = 48; /* 192 bytes, minimum 4 bytes per capability */
     u8 pos = PCI_CAPABILITY_LIST;
     u16 status;
 
-- 
2.43.0