[mlx_icmd] Fix compilation error in GCC versions newer than 4.6.4

Signed-off-by: Wissam Shoukair <wissams@mellanox.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/infiniband/mlx_utils/src/public/mlx_icmd.c

 				)
 {
 	mlx_status status = MLX_SUCCESS;
-	mlx_uint32 icmd_status;
+	mlx_uint32 icmd_status = MLX_FAILED;
 
 	if (utils == NULL || data == NULL) {
 		status = MLX_INVALID_PARAMETER;