drivers/mtd/nand/nand_spl_simple.c: Fix GCC 4.6 warnings

Fix warnings for both cases:

definded CONFIG_SYS_NAND_HW_ECC_OOBFIRST:
nand_spl_simple.c: In function 'nand_read_page':
nand_spl_simple.c:156:6: warning: variable 'stat' set but not used
[-Wunused-but-set-variable]

not definded CONFIG_SYS_NAND_HW_ECC_OOBFIRST:
nand_spl_simple.c: In function 'nand_read_page':
nand_spl_simple.c:196:6: warning: variable 'stat' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Scott Wood <scottwood@freescale.com>
Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

drivers/mtd/nand/nand_spl_simple.c

@@ -153,7 +153,6 @@ static int nand_read_page(int block, int page, uchar *dst)
 	int eccbytes = CONFIG_SYS_NAND_ECCBYTES;
 	int eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
 	uint8_t *p = dst;
-	int stat;
 
 	/*
 	 * No malloc available for now, just use some temporary locations
@@ -176,7 +175,7 @@ static int nand_read_page(int block, int page, uchar *dst)
 		this->ecc.hwctl(&mtd, NAND_ECC_READ);
 		this->read_buf(&mtd, p, eccsize);
 		this->ecc.calculate(&mtd, p, &ecc_calc[i]);
-		stat = this->ecc.correct(&mtd, p, &ecc_code[i], &ecc_calc[i]);
+		this->ecc.correct(&mtd, p, &ecc_code[i], &ecc_calc[i]);
 	}
 
 	return 0;
@@ -193,7 +192,6 @@ static int nand_read_page(int block, int page, void *dst)
 	int eccbytes = CONFIG_SYS_NAND_ECCBYTES;
 	int eccsteps = CONFIG_SYS_NAND_ECCSTEPS;
 	uint8_t *p = dst;
-	int stat;
 
 	nand_command(block, page, 0, NAND_CMD_READ0);
 
@@ -224,7 +222,7 @@ static int nand_read_page(int block, int page, void *dst)
 		 * from correct_data(). We just hope that all possible errors
 		 * are corrected by this routine.
 		 */
-		stat = this->ecc.correct(&mtd, p, &ecc_code[i], &ecc_calc[i]);
+		this->ecc.correct(&mtd, p, &ecc_code[i], &ecc_calc[i]);
 	}
 
 	return 0;