drm/i915: Silence GCC warning for cmn_a_well

Just make the logic simple enough for even GCC to understand (and
foolproof against random changes):

drivers/gpu/drm/i915/intel_runtime_pm.c: warning: 'cmn_a_well' may be
used uninitialized in this function [-Wuninitialized]:  => 871:23

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1471284383-22324-1-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Imre Deak <imre.deak@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index d659d6f5b8d3..a1d73c2de332 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -856,7 +856,7 @@ static void bxt_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
                                            struct i915_power_well *power_well)
 {
         enum skl_disp_power_wells power_well_id = power_well->data;
-        struct i915_power_well *cmn_a_well;
+        struct i915_power_well *cmn_a_well = NULL;
 
         if (power_well_id == BXT_DPIO_CMN_BC) {
                 /*
@@ -869,7 +869,7 @@ static void bxt_dpio_cmn_power_well_enable(struct drm_i915_private *dev_priv,
 
         bxt_ddi_phy_init(dev_priv, bxt_power_well_to_phy(power_well));
 
-        if (power_well_id == BXT_DPIO_CMN_BC)
+        if (cmn_a_well)
                 intel_power_well_put(dev_priv, cmn_a_well);
 }