new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 0cea3db..27cb9eb 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -140,12 +140,12 @@
 int ima_collect_measurement(struct integrity_iint_cache *iint,
 			    struct file *file)
 {
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	const char *filename = file->f_dentry->d_name.name;
 	int result = 0;
 
 	if (!(iint->flags & IMA_COLLECTED)) {
-		u64 i_version = file->f_dentry->d_inode->i_version;
+		u64 i_version = file_inode(file)->i_version;
 
 		iint->ima_xattr.type = IMA_XATTR_DIGEST;
 		result = ima_calc_hash(file, iint->ima_xattr.digest);
@@ -182,7 +182,7 @@
 	const char *op = "add_template_measure";
 	const char *audit_cause = "ENOMEM";
 	int result = -ENOMEM;
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	struct ima_template_entry *entry;
 	int violation = 0;