drm/radeon: remove some buggy dead code

The calculation of "num_shader_engines" has a precedence bug because
the right shift happens before the mask, but this variable is never used
so we can just delete it.

Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/radeon/evergreen.c

···
 	u32 vgt_cache_invalidation;
 	u32 hdp_host_path_cntl, tmp;
 	u32 disabled_rb_mask;
-	int i, j, num_shader_engines, ps_thread_count;
+	int i, j, ps_thread_count;
 
 	switch (rdev->family) {
 	case CHIP_CYPRESS:
···
 	rdev->config.evergreen.tile_config |= 0 << 8;
 	rdev->config.evergreen.tile_config |=
 		((gb_addr_config & 0x30000000) >> 28) << 12;
-
-	num_shader_engines = (gb_addr_config & NUM_SHADER_ENGINES(3) >> 12) + 1;
 
 	if ((rdev->family >= CHIP_CEDAR) && (rdev->family <= CHIP_HEMLOCK)) {
 		u32 efuse_straps_4;