i965: Resolve GCC sign-compare warning.

i965: Resolve GCC sign-compare warning.

mesa/src/mesa/drivers/dri/i965/brw_eu_compact.c: In function 'set_3src_control_index':
mesa/src/mesa/drivers/dri/i965/brw_eu_compact.c:805:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int i = 0; i < ARRAY_SIZE(gen8_3src_control_index_table); i++) {
                      ^
mesa/src/mesa/drivers/dri/i965/brw_eu_compact.c: In function 'set_3src_source_index':
mesa/src/mesa/drivers/dri/i965/brw_eu_compact.c:839:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int i = 0; i < ARRAY_SIZE(gen8_3src_source_index_table); i++) {
                      ^
mesa/src/mesa/drivers/dri/i965/brw_state_dump.c: In function 'dump_sampler_state':
mesa/src/mesa/drivers/dri/i965/brw_state_dump.c:382:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (i = 0; i < size / 16; i++) {
                  ^
mesa/src/mesa/drivers/dri/i965/brw_state_upload.c: In function 'brw_pipeline_state_finished':
mesa/src/mesa/drivers/dri/i965/brw_state_upload.c:801:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if (i != pipeline) {
             ^
mesa/src/mesa/drivers/dri/i965/intel_mipmap_tree.c: In function 'intel_gen7_hiz_buf_create':
mesa/src/mesa/drivers/dri/i965/intel_mipmap_tree.c:1544:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int level = mt->first_level; level <= mt->last_level; ++level) {
                                               ^
mesa/src/mesa/drivers/dri/i965/intel_mipmap_tree.c: In function 'intel_gen8_hiz_buf_create':
mesa/src/mesa/drivers/dri/i965/intel_mipmap_tree.c:1638:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int level = mt->first_level; level <= mt->last_level; ++level) {
                                            ^
mesa/src/mesa/drivers/dri/i965/intel_mipmap_tree.c: In function 'intel_miptree_alloc_hiz':
mesa/src/mesa/drivers/dri/i965/intel_mipmap_tree.c:1771:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int level = mt->first_level; level <= mt->last_level; ++level) {
                                            ^
mesa/src/mesa/drivers/dri/i965/intel_mipmap_tree.c:1775:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int layer = 0; layer < mt->level[level].depth; ++layer) {
                                 ^

Signed-off-by: Rhys Kidd <rhyskidd@gmail.com>
Reviewed-by: Thomas Helland <thomashelland90@gmail.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>