fix build for < 6.2 again

src/keymash.c

@@ -8,6 +8,7 @@
 #include <linux/random.h>
 #include <linux/slab.h>
 #include <linux/types.h>
+#include <linux/version.h>
 
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("fef <owo@fef.moe>");
@@ -67,7 +68,11 @@ static const struct file_operations keymash_fops = {
 	.read = keymash_read,
 };
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 2, 0)
+static char *keymash_devnode(struct device *dev, umode_t *mode)
+#else
 static char *keymash_devnode(const struct device *dev, umode_t *mode)
+#endif
 {
 	if (mode)
 		*mode = 0444;