phy: qcom: qmp-usbc: Simplify check for non-NULL pointer

phy: qcom: qmp-usbc: Simplify check for non-NULL pointer

Pointers should not use explicit '0' comparison, so just use standard
evaluation as non-NULL:

  phy-qcom-qmp-usbc.c:1682:31: warning: Using plain integer as NULL pointer

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://patch.msgid.link/20260216110413.159994-6-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>