chore(xilinx): propagate error code

Propagate error instead of making own error code.

Change-Id: I9300ad342e98ca0e730b091510d9d62747b81a5f
Signed-off-by: Maheedhar Bollapalli <maheedharsai.bollapalli@amd.com>
diff --git a/plat/xilinx/common/plat_fdt.c b/plat/xilinx/common/plat_fdt.c
index ae2c1ea..62b46a9 100644
--- a/plat/xilinx/common/plat_fdt.c
+++ b/plat/xilinx/common/plat_fdt.c
@@ -37,16 +37,15 @@
 {
 	int32_t ret = 0;
 
-	if (fdt_check_header(fdt) != 0) {
+	ret = fdt_check_header(fdt);
+	if (ret != 0) {
 		ERROR("Can't read DT at %p\n", fdt);
-		ret = -FDT_ERR_NOTFOUND;
 		goto error;
 	}
 
 	ret = fdt_open_into(fdt, fdt, XILINX_OF_BOARD_DTB_MAX_SIZE);
 	if (ret < 0) {
 		ERROR("Invalid Device Tree at %p: error %d\n", fdt, ret);
-		ret = -FDT_ERR_NOTFOUND;
 		goto error;
 	}