OMAP24xx: CM: fix mask used for checking IDLEST status

On OMAP24xx, the polarity for the IDLEST bits is opposite of OMAP3.
The mask used to check this was using the bit position instead of the
bit mask.

This patch fixes the problem by using the bit mask instead of the bit
field.

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
diff --git a/arch/arm/mach-omap2/cm.c b/arch/arm/mach-omap2/cm.c
index 2d83565..721c3b6 100644
--- a/arch/arm/mach-omap2/cm.c
+++ b/arch/arm/mach-omap2/cm.c
@@ -50,15 +50,15 @@
 
 	cm_idlest_reg = cm_idlest_offs[idlest_id - 1];
 
+	mask = 1 << idlest_shift;
+
 	if (cpu_is_omap24xx())
-		ena = idlest_shift;
+		ena = mask;
 	else if (cpu_is_omap34xx())
 		ena = 0;
 	else
 		BUG();
 
-	mask = 1 << idlest_shift;
-
 	/* XXX should be OMAP2 CM */
 	omap_test_timeout(((cm_read_mod_reg(prcm_mod, cm_idlest_reg) & mask) == ena),
 			  MAX_MODULE_READY_TIME, i);