rlc.h: Fix typo in param name

The function definition in rlc.cpp already uses the correct param name.

Change-Id: Ifd55fca3c04b72cef3a8f27d6826bc8529e85ec7
diff --git a/src/rlc.h b/src/rlc.h
index 73a537f..a9d5d0b 100644
--- a/src/rlc.h
+++ b/src/rlc.h
@@ -313,7 +313,7 @@
 			uint16_t first_bsn, uint16_t *lost,
 			uint16_t *received);
 	int move_window();
-	void show_state(char *show_rbb);
+	void show_state(char *show_v_b);
 	int count_unacked();
 
 	uint16_t m_v_s;	/* send state */