drm/amdgpu: Clean up errors in mmhub_v9_4.c

Fix the following errors reported by checkpatch:

ERROR: code indent should use tabs where possible
ERROR: space required before the open parenthesis '('
Signed-off-by: Ran Sun <sunran001@208suo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/mmhub_v9_4.c

@@ -108,7 +108,7 @@ static void mmhub_v9_4_setup_vm_pt_regs(struct amdgpu_device *adev, uint32_t vmi
 }
 
 static void mmhub_v9_4_init_system_aperture_regs(struct amdgpu_device *adev,
-					         int hubid)
+						int hubid)
 {
 	uint64_t value;
 	uint32_t tmp;
@@ -1568,7 +1568,7 @@ static int mmhub_v9_4_get_ras_error_count(struct amdgpu_device *adev,
 	uint32_t sec_cnt, ded_cnt;
 
 	for (i = 0; i < ARRAY_SIZE(mmhub_v9_4_ras_fields); i++) {
-		if(mmhub_v9_4_ras_fields[i].reg_offset != reg->reg_offset)
+		if (mmhub_v9_4_ras_fields[i].reg_offset != reg->reg_offset)
 			continue;
 
 		sec_cnt = (value &