befs: Convert befs_symlink_read_folio() to use folio_end_read()

This is slightly more efficient than separate calls to
folio_mark_uptodate() and folio_unlock(), and it's easier to read.
Get rid of the call to folio_set_error() as nobody will check this flag.

Cc: Luis de Bethencourt <luisbg@kernel.org>
Cc: Salah Triki <salah.triki@gmail.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Link: https://lore.kernel.org/r/20240530202110.2653630-2-willy@infradead.orgSigned-off-by: Christian Brauner <brauner@kernel.org>

fs/befs/linuxvfs.c

@@ -475,6 +475,7 @@ static int befs_symlink_read_folio(struct file *unused, struct folio *folio)
 	befs_data_stream *data = &befs_ino->i_data.ds;
 	befs_off_t len = data->size;
 	char *link = folio_address(folio);
+	int err = -EIO;
 
 	if (len == 0 || len > PAGE_SIZE) {
 		befs_error(sb, "Long symlink with illegal length");
@@ -487,13 +488,10 @@ static int befs_symlink_read_folio(struct file *unused, struct folio *folio)
 		goto fail;
 	}
 	link[len - 1] = '\0';
-	folio_mark_uptodate(folio);
-	folio_unlock(folio);
-	return 0;
+	err = 0;
 fail:
-	folio_set_error(folio);
-	folio_unlock(folio);
-	return -EIO;
+	folio_end_read(folio, err == 0);
+	return err;
 }
 
 /*