Nios2: Fix compiler warnings in lib_nios2/board.c (unused variables)

Signed-off-by: Scott McNutt <smcnutt@psyent.com>
diff --git a/lib_nios2/board.c b/lib_nios2/board.c
index 008f04f..41d3297 100644
--- a/lib_nios2/board.c
+++ b/lib_nios2/board.c
@@ -83,8 +83,6 @@
 {
 	bd_t *bd;
 	init_fnc_t **init_fnc_ptr;
-	char *s, *e;
-	int i;
 
 	/* Pointer is writable since we allocated a register for it.
 	 * Nios treats CONFIG_SYS_GBL_DATA_OFFSET as an address.