PCI: meson: Remove cast between incompatible function type

Rather than casting void(*)(struct clk *) to void (*)(void *), that
forces conversion to an incompatible function type, replace the cast
with a small local stub function with a signature that matches what
the devm_add_action_or_reset() function expects.

The sub function takes a void *, then passes it directly to
clk_disable_unprepare(), which handles the more specific type.

Reported by clang when building with warnings enabled:

  drivers/pci/controller/dwc/pci-meson.c:191:6: warning: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
                                   (void (*) (void *))clk_disable_unprepare,
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No functional changes are intended.

Fixes: 9c0ef6d ("PCI: amlogic: Add the Amlogic Meson PCIe controller driver")
Link: https://lore.kernel.org/linux-pci/20230629165956.237832-1-kwilczynski@kernel.org
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

Author: kwilczynski

drivers/pci/controller/dwc/pci-meson.c

@@ -163,6 +163,13 @@ static int meson_pcie_reset(struct meson_pcie *mp)
 	return 0;
 }
 
+static inline void meson_pcie_disable_clock(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static inline struct clk *meson_pcie_probe_clock(struct device *dev,
 						 const char *id, u64 rate)
 {
@@ -187,9 +194,7 @@ static inline struct clk *meson_pcie_probe_clock(struct device *dev,
 		return ERR_PTR(ret);
 	}
 
-	devm_add_action_or_reset(dev,
-				 (void (*) (void *))clk_disable_unprepare,
-				 clk);
+	devm_add_action_or_reset(dev, meson_pcie_disable_clock, clk);
 
 	return clk;
 }