gpu: host1x: fix error return code in host1x_probe()

BugLink: https://bugs.launchpad.net/bugs/1810807

[ Upstream commit 7b2c63de ]

platform_get_irq() returns an error code, but the host1x driver
ignores it and always returns -ENXIO. This is not correct and,
prevents -EPROBE_DEFER from being propagated properly.

Notice that platform_get_irq() no longer returns 0 on error:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e330b9a6bb35dc7097a4f02cb1ae7b6f96df92af

Print and propagate the return value of platform_get_irq on failure.

This issue was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

drivers/gpu/host1x/dev.c

@@ -116,8 +116,8 @@ static int host1x_probe(struct platform_device *pdev)
 
 	syncpt_irq = platform_get_irq(pdev, 0);
 	if (syncpt_irq < 0) {
-		dev_err(&pdev->dev, "failed to get IRQ\n");
-		return -ENXIO;
+		dev_err(&pdev->dev, "failed to get IRQ: %d\n", syncpt_irq);
+		return syncpt_irq;
 	}
 
 	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);