drm/amdgpu: do not store bios_header_start in amdgpu_device

It is only used locally in amdgpu_get_bios

Signed-off-by: Nils Wallménius <nils.wallmenius@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
index 80add22..99ca75b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_bios.c
@@ -349,7 +349,7 @@
 bool amdgpu_get_bios(struct amdgpu_device *adev)
 {
 	bool r;
-	uint16_t tmp;
+	uint16_t tmp, bios_header_start;
 
 	r = amdgpu_atrm_get_bios(adev);
 	if (r == false)
@@ -383,11 +383,11 @@
 		goto free_bios;
 	}
 
-	adev->bios_header_start = RBIOS16(0x48);
-	if (!adev->bios_header_start) {
+	bios_header_start = RBIOS16(0x48);
+	if (!bios_header_start) {
 		goto free_bios;
 	}
-	tmp = adev->bios_header_start + 4;
+	tmp = bios_header_start + 4;
 	if (!memcmp(adev->bios + tmp, "ATOM", 4) ||
 	    !memcmp(adev->bios + tmp, "MOTA", 4)) {
 		adev->is_atom_bios = true;