hwspinlock: omap: Handle devm_pm_runtime_enable() errors

Although unlikely, devm_pm_runtime_enable() can fail due to memory
allocations. Without proper error handling, the subsequent
pm_runtime_resume_and_get() call may operate on incorrectly
initialized runtime PM state.

Add error handling to check the return value of
devm_pm_runtime_enable() and return on failure.

Fixes: 25f7d74d4514 ("hwspinlock: omap: Use devm_pm_runtime_enable() helper")
Signed-off-by: Haotian Zhang <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Kevin Hilman <[e-mail]>

drivers/hwspinlock/omap_hwspinlock.c

···
 	 * make sure the module is enabled and clocked before reading
 	 * the module SYSSTATUS register
 	 */
-	devm_pm_runtime_enable(&pdev->dev);
+	ret = devm_pm_runtime_enable(&pdev->dev);
+	if (ret)
+		return ret;
 	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret < 0)
 		return ret;