tegra20: initialize variable to avoid compiler warning

Initialize this variable to avoid a compiler warning about possible
use of uninitialized variable with gcc 4.4.6.

Signed-off-by: Allen Martin <amartin@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/cpu/tegra20-common/emc.c

@@ -257,7 +257,7 @@ static int decode_emc(const void *blob, unsigned rate, struct emc_ctlr **emcp,
 int tegra_set_emc(const void *blob, unsigned rate)
 {
 	struct emc_ctlr *emc;
-	const u32 *table;
+	const u32 *table = NULL;
 	int err, i;
 
 	err = decode_emc(blob, rate, &emc, &table);