acct: avoid pointless reference count bump

file->f_cred already holds a reference count that is stable during the
operation.

Link: https://lore.kernel.org/r/20241125-work-cred-v2-23-68b9d38bb5b2@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: brauner

kernel/acct.c

@@ -501,7 +501,7 @@ static void do_acct_process(struct bsd_acct_struct *acct)
 	flim = rlimit(RLIMIT_FSIZE);
 	current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 	/* Perform file operations on behalf of whoever enabled accounting */
-	orig_cred = override_creds(get_new_cred(file->f_cred));
+	orig_cred = override_creds(file->f_cred);
 
 	/*
 	 * First check to see if there is enough free_space to continue
@@ -541,7 +541,7 @@ static void do_acct_process(struct bsd_acct_struct *acct)
 	}
 out:
 	current->signal->rlim[RLIMIT_FSIZE].rlim_cur = flim;
-	put_cred(revert_creds(orig_cred));
+	revert_creds(orig_cred);
 }
 
 /**