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If device was probed with incorrect DT or ACPI tables, the IO memory
resource would be missing and driver would derefernce NULL pointer in
sc8180x_pinctrl_add_tile_resources().  Add simplep check if IO memory
resource was provided to silence Smatch warning:

  drivers/pinctrl/qcom/pinctrl-sc8180x.c:1664 sc8180x_pinctrl_add_tile_resources() error: potentially dereferencing uninitialized 'mres'.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230513113510.177666-1-krzysztof.kozlowski@linaro.org

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>