PCI: rzg3s-host: Initialize MSI status bitmap before use

Initialize rzg3s_pcie_msi_irq() MSI status bitmap before use.

Fixes: 7ef502fb35b2 ("PCI: Add Renesas RZ/G3S host controller driver")
Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/all/[e-mail]
Closes: https://lore.kernel.org/all/[e-mail]
Signed-off-by: Claudiu Beznea <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/pci/controller/pcie-rzg3s-host.c

···
 static irqreturn_t rzg3s_pcie_msi_irq(int irq, void *data)
 {
 	u8 regs = RZG3S_PCI_MSI_INT_NR / RZG3S_PCI_MSI_INT_PER_REG;
-	DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR);
+	DECLARE_BITMAP(bitmap, RZG3S_PCI_MSI_INT_NR) = {0};
 	struct rzg3s_pcie_host *host = data;
 	struct rzg3s_pcie_msi *msi = &host->msi;
 	unsigned long bit;