drm/i915: Silence compiler warning for seltests/i915_gem_coherency

In general, the compiler should not be able to detect if we do any
passes through the test loops:

	In file included from drivers/gpu/drm/i915/i915_gem.c:5029:
	drivers/gpu/drm/i915/selftests/i915_gem_coherency.c: In function 'igt_gem_coherency':
	drivers/gpu/drm/i915/selftests/i915_gem_coherency.c:274: error: 'err' may be used uninitialized in this function

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170214143509.15719-1-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_coherency.c b/drivers/gpu/drm/i915/selftests/i915_gem_coherency.c
index ad92c60..f08d017 100644 (file)
--- a/drivers/gpu/drm/i915/selftests/i915_gem_coherency.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_coherency.c
@@ -272,7 +272,7 @@ static int igt_gem_coherency(void *arg)
        struct drm_i915_gem_object *obj;
        unsigned long count, n;
        u32 *offsets, *values;
-       int err;
+       int err = 0;
 
        /* We repeatedly write, overwrite and read from a sequence of
         * cachelines in order to try and detect incoherency (unflushed writes