don't open-code file_inode()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

kernel/events/core.c

@@ -6701,7 +6701,7 @@ static bool perf_addr_filter_match(struct perf_addr_filter *filter,
 				     struct file *file, unsigned long offset,
 				     unsigned long size)
 {
-	if (filter->inode != file->f_inode)
+	if (filter->inode != file_inode(file))
 		return false;
 
 	if (filter->offset > offset + size)