map_iovm_area is only called from a context where its second argument is

known not to be NULL, so drop the unnecessary test.  If new could be NULL,
the initialization of da should be moved below the test.

A simplified version of the semantic match that detects this problem is as
follows (http://coccinelle.lip6.fr/):

// <smpl>
@match exists@
expression x, E;
identifier fld;
@@

* x->fld
  ... when != \(x = E\|&x\)
* x == NULL
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/arm/plat-omap/iovmm.c

@@ -446,7 +446,7 @@ static int map_iovm_area(struct iommu *obj, struct iovm_struct *new,
 	struct scatterlist *sg;
 	u32 da = new->da_start;
 
-	if (!obj || !new || !sgt)
+	if (!obj || !sgt)
 		return -EINVAL;
 
 	BUG_ON(!sgtable_ok(sgt));