[PATCH] i915: avoid unused-but-set-variable warning

[Arnd Bergmann <arnd@kernel.org>]

From: Arnd Bergmann <arnd@arndb.de>

The mchbar_addr variable is only used inside of an #ifdef:

drivers/gpu/drm/i915/soc/intel_gmch.c:41:6: error: variable 'mchbar_addr' set but not used [-Werror,-Wunused-but-set-variable]

Change this to an IS_ENABLED() check to let the compiler see how
it's used and no longer warn about it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 drivers/gpu/drm/i915/soc/intel_gmch.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/soc/intel_gmch.c b/drivers/gpu/drm/i915/soc/intel_gmch.c
index 6d0204942f7a5..49c7fb16e934f 100644
--- a/drivers/gpu/drm/i915/soc/intel_gmch.c
+++ b/drivers/gpu/drm/i915/soc/intel_gmch.c
@@ -47,11 +47,9 @@ intel_alloc_mchbar_resource(struct drm_i915_private *i915)
 	mchbar_addr = ((u64)temp_hi << 32) | temp_lo;
 
 	/* If ACPI doesn't have it, assume we need to allocate it ourselves */
-#ifdef CONFIG_PNP
-	if (mchbar_addr &&
+	if (IS_ENABLED(CONFIG_PNP) && mchbar_addr &&
 	    pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE))
 		return 0;
-#endif
 
 	/* Get some space for it */
 	i915->gmch.mch_res.name = "i915 MCHBAR";
-- 
2.39.2