gtp-kernel: Remove dependency to cmdline.[ch]

Change-Id: I760f25df609c309eba4d5716f3e23b49320449bf
diff --git a/ggsn/gtp-kernel.h b/ggsn/gtp-kernel.h
index b3b29e3..34fd7bf 100644
--- a/ggsn/gtp-kernel.h
+++ b/ggsn/gtp-kernel.h
@@ -8,8 +8,7 @@
 
 #ifdef GTP_KERNEL
 int gtp_kernel_init(struct gsn_t *gsn, struct in_addr *net,
-		    size_t prefixlen,
-		    struct gengetopt_args_info *args_info);
+		    size_t prefixlen, const char *net_arg);
 void gtp_kernel_stop(void);
 
 int gtp_kernel_tunnel_add(struct pdp_t *pdp);
@@ -19,15 +18,10 @@
 
 #else
 static inline int gtp_kernel_init(struct gsn_t *gsn, struct in_addr *net,
-				  size_t prefixlen,
-				  struct gengetopt_args_info *args_info)
+				  size_t prefixlen, const char *net_arg)
 {
-	if (args_info->gtp_linux_given) {
-		SYS_ERR(DGGSN, LOGL_ERROR, 0,
-			"ggsn compiled without GTP kernel support!\n");
-		return -1;
-	}
-	return 0;
+	SYS_ERR(DGGSN, LOGL_ERROR, 0, "ggsn compiled without GTP kernel support!\n");
+	return -1;
 }
 
 static inline void gtp_kernel_stop(void) {}