drm/amdgpu/gfx: refine fw hdr check fuction

The return value of function amdgpu_ucode_hdr_version
doesn't make sense, so change it to return true when
fw header version is match with passed in parameters.

Signed-off-by: Wenhui Sheng <[e-mail]>
Signed-off-by: Likun Gao <[e-mail]>
Reviewed-by: Hawking Zhang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 {
 	if ((hdr->common.header_version_major == hdr_major) &&
 		(hdr->common.header_version_minor == hdr_minor))
-		return false;
-	return true;
+		return true;
+	return false;
 }
 
 enum amdgpu_firmware_load_type