fdget(), more trivial conversions

all failure exits prior to fdget() leave the scope, all matching fdput()
are immediately followed by leaving the scope.

[xfs_ioc_commit_range() chunk moved here as well]

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

security/loadpin/loadpin.c

@@ -283,7 +283,6 @@ enum loadpin_securityfs_interface_index {
 
 static int read_trusted_verity_root_digests(unsigned int fd)
 {
-	struct fd f;
 	void *data;
 	int rc;
 	char *p, *d;
@@ -295,8 +294,8 @@ static int read_trusted_verity_root_digests(unsigned int fd)
 	if (!list_empty(&dm_verity_loadpin_trusted_root_digests))
 		return -EPERM;
 
-	f = fdget(fd);
-	if (!fd_file(f))
+	CLASS(fd, f)(fd);
+	if (fd_empty(f))
 		return -EINVAL;
 
 	data = kzalloc(SZ_4K, GFP_KERNEL);
@@ -359,7 +358,6 @@ static int read_trusted_verity_root_digests(unsigned int fd)
 	}
 
 	kfree(data);
-	fdput(f);
 
 	return 0;
 
@@ -379,8 +377,6 @@ err:
 	/* disallow further attempts after reading a corrupt/invalid file */
 	deny_reading_verity_digests = true;
 
-	fdput(f);
-
 	return rc;
 }