[patch] drm/radeon: remove some buggy dead code

[Dan Carpenter]

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 <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/radeon/evergreen.c 
b/drivers/gpu/drm/radeon/evergreen.c
index a31f1ca..f37d39d 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -3005,7 +3005,7 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
        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:
@@ -3303,8 +3303,6 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
        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;
                u32 efuse_straps_3;