[PATCH] drm/edid: fixup EDID 1.3 and 1.4 judge reduced-blanking timings logic

[kbuild test robot]

Hi allen,

I love your patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v5.4-rc5 next-20191031]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/allen/drm-edid-fixup-EDID-1-3-and-1-4-judge-reduced-blanking-timings-logic/20191102-200357
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1204c70d9dcba31164f78ad5d8c88c42335d51f8

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp at intel.com>

smatch warnings:
drivers/gpu/drm/drm_edid.c:2042 drm_monitor_supports_rb() warn: always true condition '(closure.support_rb >= 0) => (0-255 >= 0)'

vim +2042 drivers/gpu/drm/drm_edid.c

  2030	
  2031	/* EDID 1.4 defines this explicitly.  For EDID 1.3, we guess, badly. */
  2032	static bool
  2033	drm_monitor_supports_rb(struct edid *edid)
  2034	{
  2035		struct edid_support_rb_closure closure = {
  2036			.edid = edid,
  2037			.support_rb = -1,
  2038		};
  2039	
  2040		if (edid->revision >= 4) {
  2041			drm_for_each_detailed_block((u8 *)edid, is_rb, &closure);
> 2042			if (closure.support_rb >= 0)
  2043				return closure.support_rb;
  2044		}
  2045	
  2046		return true;
  2047	}
  2048	

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