drm/amd/amdgpu: Fix missing error return on kzalloc failure

Currently the kzalloc failure check just sets reports the failure
and sets the variable ret to -ENOMEM, which is not checked later
for this specific error. Fix this by just returning -ENOMEM rather
than setting ret.

Fixes: 4fb9307 ("drm/amd/amdgpu: remove redundant host to psp cmd buf allocations")
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
(cherry picked from commit 1ee9d1a)

Author: ColinIanKing

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

@@ -448,7 +448,7 @@ static int psp_sw_init(struct amdgpu_ip_block *ip_block)
 	psp->cmd = kzalloc(sizeof(struct psp_gfx_cmd_resp), GFP_KERNEL);
 	if (!psp->cmd) {
 		dev_err(adev->dev, "Failed to allocate memory to command buffer!\n");
-		ret = -ENOMEM;
+		return -ENOMEM;
 	}
 
 	adev->psp.xgmi_context.supports_extended_data =