drm/i915/selftests: Silence compiler warning in igt_ctx_exec

The compiler doesn't always spot the guard that object is allocated on
the first pass, leading to:

drivers/gpu/drm/i915/selftests/i915_gem_context.c: warning: 'obj' may be used uninitialized in this function [-Wuninitialized]:  => 370:8

v2: Make it more obvious by setting obj to NULL on the first pass and
any later pass where we need to reallocate.

Reported-by: Geert Uytterhoeven <[email protected]>
Fixes: 791ff39ae32a ("drm/i915: Live testing for context execution")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
Cc: Matthew Auld <[email protected]>
c: <[email protected]> # v4.12-rc1+
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Tvrtko Ursulin <[email protected]>

0 files changed, 0 insertions, 0 deletions