SVN r258549 breaks -current compiled with gcc

[Michael Butler]

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As follows:

- --- drm_linux_list_sort.o ---
cc1: warnings being treated as errors
/usr/src/sys/modules/drm2/drm2/../../../dev/drm2/drm_linux_list_sort.c:
In function 'drm_le_cmp':
/usr/src/sys/modules/drm2/drm2/../../../dev/drm2/drm_linux_list_sort.c:45:
warning: cast discards qualifiers from pointer target type
/usr/src/sys/modules/drm2/drm2/../../../dev/drm2/drm_linux_list_sort.c:46:
warning: cast discards qualifiers from pointer target type
*** [drm_linux_list_sort.o] Error code 1

	imb
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