Logical negate is always false here.  This was found by Sparse:
drivers/gpu/drm/gma500/psb_irq.c:407:17: warning: dubious: x & !y

Signed-off-by: Dan Carpenter <[email protected]>

diff --git a/drivers/gpu/drm/gma500/psb_irq.c b/drivers/gpu/drm/gma500/psb_irq.c
index 7be802b..4ce680f 100644
--- a/drivers/gpu/drm/gma500/psb_irq.c
+++ b/drivers/gpu/drm/gma500/psb_irq.c
@@ -404,7 +404,7 @@ void psb_irq_turn_off_dpst(struct drm_device *dev)
                psb_disable_pipestat(dev_priv, 0, PIPE_DPST_EVENT_ENABLE);
 
                pwm_reg = PSB_RVDC32(PWM_CONTROL_LOGIC);
-               PSB_WVDC32(pwm_reg & !(PWM_PHASEIN_INT_ENABLE),
+               PSB_WVDC32(pwm_reg & ~PWM_PHASEIN_INT_ENABLE,
                                                        PWM_CONTROL_LOGIC);
                pwm_reg = PSB_RVDC32(PWM_CONTROL_LOGIC);
 
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