stingray: fix coverity reported issues on brcm platform

fix coverity reported issues
1. uninitialized var,
2. check for negative val on unsigned variable

Signed-off-by: Sheetal Tigadoli <sheetal.tigadoli@broadcom.com>
Change-Id: I28b7517135ba6c1ba0df04f0c73189cf84ba89e6
diff --git a/plat/brcm/board/stingray/src/bl2_setup.c b/plat/brcm/board/stingray/src/bl2_setup.c
index 9a79744..b2c8aec 100644
--- a/plat/brcm/board/stingray/src/bl2_setup.c
+++ b/plat/brcm/board/stingray/src/bl2_setup.c
@@ -682,7 +682,7 @@
 	bcm_board_detect();
 #ifdef DRIVER_EMMC_ENABLE
 	/* Initialize the card, if it is not */
-	if (bcm_emmc_init(true) < 0)
+	if (bcm_emmc_init(true) == 0)
 		WARN("eMMC Card Initialization Failed!!!\n");
 #endif