reiserfs: Replace kmalloc with kcalloc in the comment

Use kcalloc instead of kmalloc in the comment according to
the previous kcalloc() call.

Link: https://lore.kernel.org/r/1590714150-15895-1-git-send-email-wang.yi59@zte.com.cnSigned-off-by: Liao Pingfang <liao.pingfang@zte.com.cn>
Signed-off-by: Jan Kara <jack@suse.cz>

fs/reiserfs/inode.c

@@ -1066,7 +1066,7 @@ int reiserfs_get_block(struct inode *inode, sector_t block,
 			} else {
 				/* paste hole to the indirect item */
 				/*
-				 * If kmalloc failed, max_to_insert becomes
+				 * If kcalloc failed, max_to_insert becomes
 				 * zero and it means we only have space for
 				 * one block
 				 */