PCI: dwc: Fix potential truncation in dw_pcie_edma_irq_verify()

Increase the size of the string buffer to avoid potential truncation in
dw_pcie_edma_irq_verify().

This fixes the following build warning when compiling with W=1:

  drivers/pci/controller/dwc/pcie-designware.c: In function ‘dw_pcie_edma_detect’:
  drivers/pci/controller/dwc/pcie-designware.c:989:50: warning: ‘%d’ directive output may be truncated writing between 1 and 11 bytes into a region of size 3 [-Wformat-truncation=]
    989 |                 snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
        |                                                  ^~

Link: https://lore.kernel.org/r/20250104002119.2681246-2-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Author: floatious

drivers/pci/controller/dwc/pcie-designware.c

@@ -970,7 +970,7 @@ static int dw_pcie_edma_irq_verify(struct dw_pcie *pci)
 {
 	struct platform_device *pdev = to_platform_device(pci->dev);
 	u16 ch_cnt = pci->edma.ll_wr_cnt + pci->edma.ll_rd_cnt;
-	char name[6];
+	char name[15];
 	int ret;
 
 	if (pci->edma.nr_irqs == 1)