board/sandburst/common/flash.c: Fix GCC 4.6 build warning

Fix:
../common/flash.c: In function 'flash_erase':
../common/flash.c:307:24: warning: variable 'l_sect' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Travis Sawyer <travis.sawyer@sandburst.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>

board/sandburst/common/flash.c

@@ -304,7 +304,7 @@ int flash_erase (flash_info_t *info, int s_first, int s_last)
 {
 	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
 	volatile FLASH_WORD_SIZE *addr2;
-	int flag, prot, sect, l_sect;
+	int flag, prot, sect;
 	int i;
 
 	if ((s_first < 0) || (s_first > s_last)) {
@@ -335,8 +335,6 @@ int flash_erase (flash_info_t *info, int s_first, int s_last)
 		printf ("\n");
 	}
 
-	l_sect = -1;
-
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();
 
@@ -363,7 +361,6 @@ int flash_erase (flash_info_t *info, int s_first, int s_last)
 				addr[ADDR1] = (FLASH_WORD_SIZE)0x00550055;
 				addr2[0] = (FLASH_WORD_SIZE)0x00300030;	 /* sector erase */
 			}
-			l_sect = sect;
 			/*
 			 * Wait for each sector to complete, it's more
 			 * reliable.  According to AMD Spec, you must