firewire: core: fix build failure due to the caller of fw_csr_string()

A commit 47dc551 ("firewire: core: search descriptor leaf just after
vendor directory entry in root directory") for v6.8-rc3 and a commit
67a5a58 ("firewire: Kill unnecessary buf check in
device_attribute.show") for v6.9 bring build failure in for-next tree due
to the change of the name of local variable.

This commit fixes it.

Reported-by: Stephen Rothwell <[email protected]>
Closes: https://lore.kernel.org/lkml/[email protected]/
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Sakamoto <[email protected]>

Author: takaswie

drivers/firewire/core-device.c

@@ -366,7 +366,7 @@ static ssize_t show_text_leaf(struct device *dev,
 			// in the root directory follows to the directory entry for vendor ID
 			// instead of the immediate value for vendor ID.
 			result = fw_csr_string(directories[i], CSR_DIRECTORY | attr->key, buf,
-					       bufsize);
+					       PAGE_SIZE - 1);
 			if (result >= 0)
 				ret = result;
 		}