jfs: remove redundant assignments to ipaimap and ipaimap2

The pointers ipaimap and ipaimap2 are re-assigned with values a second
time with the same values when they were initialized. The re-assignments
are redundant and can be removed.

Cleans up two clang scan build warnings:
fs/jfs/jfs_umount.c:42:16: warning: Value stored to 'ipaimap' during
its initialization is never read [deadcode.DeadStores]

fs/jfs/jfs_umount.c:43:16: warning: Value stored to 'ipaimap2' during
its initialization is never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

fs/jfs/jfs_umount.c

@@ -68,7 +68,6 @@ int jfs_umount(struct super_block *sb)
 	/*
 	 * close secondary aggregate inode allocation map
 	 */
-	ipaimap2 = sbi->ipaimap2;
 	if (ipaimap2) {
 		diUnmount(ipaimap2, 0);
 		diFreeSpecial(ipaimap2);
@@ -78,7 +77,6 @@ int jfs_umount(struct super_block *sb)
 	/*
 	 * close aggregate inode allocation map
 	 */
-	ipaimap = sbi->ipaimap;
 	diUnmount(ipaimap, 0);
 	diFreeSpecial(ipaimap);
 	sbi->ipaimap = NULL;