JFS: Remove defconfig ptr comparison to 0

Remove sparse warning: Using plain integer as NULL pointer

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
diff --git a/fs/jfs/jfs_imap.c b/fs/jfs/jfs_imap.c
index 3870ba8..9bf29f7 100644
--- a/fs/jfs/jfs_imap.c
+++ b/fs/jfs/jfs_imap.c
@@ -381,7 +381,7 @@
 
 	/* read the page of disk inode */
 	mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
-	if (mp == 0) {
+	if (!mp) {
 		jfs_err("diRead: read_metapage failed");
 		return -EIO;
 	}
@@ -654,7 +654,7 @@
 	/* read the page of disk inode */
       retry:
 	mp = read_metapage(ipimap, pageno << sbi->l2nbperpage, PSIZE, 1);
-	if (mp == 0)
+	if (!mp)
 		return -EIO;
 
 	/* get the pointer to the disk inode */