OMAP: omap_device: fix nsec/usec conversion in latency calculations

Use

   usecs = nsecs / NSEC_PER_USEC;

instead of

   usecs = nsecs * NSEC_PER_USEC;
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: NPaul Walmsley <paul@pwsan.com>

arch/arm/plat-omap/omap_device.c

@@ -142,7 +142,7 @@ static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
 		read_persistent_clock(&b);
 
 		c = timespec_sub(b, a);
-		act_lat = timespec_to_ns(&c) * NSEC_PER_USEC;
+		act_lat = timespec_to_ns(&c) / NSEC_PER_USEC;
 
 		pr_debug("omap_device: %s: pm_lat %d: activate: elapsed time "
 			 "%llu usec\n", od->pdev.name, od->pm_lat_level,
@@ -198,7 +198,7 @@ static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
 		read_persistent_clock(&b);
 
 		c = timespec_sub(b, a);
-		deact_lat = timespec_to_ns(&c) * NSEC_PER_USEC;
+		deact_lat = timespec_to_ns(&c) / NSEC_PER_USEC;
 
 		pr_debug("omap_device: %s: pm_lat %d: deactivate: elapsed time "
 			 "%llu usec\n", od->pdev.name, od->pm_lat_level,