kernel: Replace ksu_access_ok with macro

Signed-off-by: rsuntk <rissu.ntk@gmail.com>

kernel/kernel_compat.h

@@ -45,5 +45,11 @@ extern ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
 				      loff_t *pos);
 extern ssize_t ksu_kernel_write_compat(struct file *p, const void *buf,
 				       size_t count, loff_t *pos);
-extern int ksu_access_ok(const void *addr, unsigned long size);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
+#define ksu_access_ok(addr, size)	(access_ok(addr, size))
+#else
+#define ksu_access_ok(addr, size)	(access_ok(VERIFY_READ, addr, size))
+#endif
+
 #endif