board/evb64260/eth.c: Fix GCC 4.6 build warning

Fix:
eth.c: In function 'gt6426x_handle_SMI':
eth.c:130:15: warning: variable 'psr' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Wolfgang Denk <wd@denx.de>

board/evb64260/eth.c

@@ -127,9 +127,10 @@ static void gt6426x_handle_SMI(struct eth_dev_s *p, unsigned int icr)
 #endif
 
     if(icr&0x10000000) {
+#ifdef DEBUG
 	unsigned int psr;
+
 	psr=GTREGREAD(ETHERNET0_PORT_STATUS_REGISTER + p->reg_base);
-#ifdef DEBUG
 	printf("PHY state change:\n"
 	       "  GT:%s:%s:%s:%s\n",
 		psr & 1 ? "100" : " 10",