iomap: Minor code simplification in iomap_dio_bio_iter()

Combine 'else' and 'if' conditional statements onto a single line and drop
unrequired braces, as is standard coding style.

The code had been like this since commit c3b0e88 ("iomap: support
REQ_OP_ZONE_APPEND").

Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20250224154538.548028-1-john.g.garry@oracle.com
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: johnpgarry

fs/iomap/direct-io.c

@@ -427,12 +427,10 @@ static loff_t iomap_dio_bio_iter(const struct iomap_iter *iter,
 			bio_put(bio);
 			goto zero_tail;
 		}
-		if (dio->flags & IOMAP_DIO_WRITE) {
+		if (dio->flags & IOMAP_DIO_WRITE)
 			task_io_account_write(n);
-		} else {
-			if (dio->flags & IOMAP_DIO_DIRTY)
-				bio_set_pages_dirty(bio);
-		}
+		else if (dio->flags & IOMAP_DIO_DIRTY)
+			bio_set_pages_dirty(bio);
 
 		dio->size += n;
 		copied += n;