drm/i915: fix header test with GCOV

$(CC) with $(CFLAGS_GCOV) assumes the output filename with .gcno suffix
appended is writable. This is not the case when the output filename is
/dev/null:

  HDRTEST drivers/gpu/drm/i915/display/intel_frontbuffer.h
/dev/null:1:0: error: cannot open /dev/null.gcno
  HDRTEST drivers/gpu/drm/i915/display/intel_ddi.h
/dev/null:1:0: error: cannot open /dev/null.gcno
make[5]: *** [../drivers/gpu/drm/i915/Makefile:307:
drivers/gpu/drm/i915/display/intel_ddi.hdrtest] Error 1
make[5]: *** Waiting for unfinished jobs....
make[5]: *** [../drivers/gpu/drm/i915/Makefile:307:
drivers/gpu/drm/i915/display/intel_frontbuffer.hdrtest] Error 1

Filter out $(CFLAGS_GVOC) from the header test $(c_flags) as they don't
make sense here anyway.

References: http://lore.kernel.org/r/[email protected]
Reported-by: Randy Dunlap <[email protected]>
Fixes: c6d4a099a240 ("drm/i915: reimplement header test feature")
Cc: Masahiro Yamada <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 408c1b3253dab93da175690dc0e21dd8bccf3371)
Signed-off-by: Jani Nikula <[email protected]>

0 files changed, 0 insertions, 0 deletions