libfdt: simplify fdt_del_mem_rsv()

The variable "err" is unneeded.

[ Device Tree Compiler commit: 36fd7331fb11276c09a6affc0d8cd4977f2fe100 ]
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Acked-by: NSimon Glass <sjg@chromium.org>

lib/libfdt/fdt_rw.c

@@ -148,17 +148,13 @@ int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
 int fdt_del_mem_rsv(void *fdt, int n)
 {
 	struct fdt_reserve_entry *re = _fdt_mem_rsv_w(fdt, n);
-	int err;
 
 	FDT_RW_CHECK_HEADER(fdt);
 
 	if (n >= fdt_num_mem_rsv(fdt))
 		return -FDT_ERR_NOTFOUND;
 
-	err = _fdt_splice_mem_rsv(fdt, re, 1, 0);
-	if (err)
-		return err;
-	return 0;
+	return _fdt_splice_mem_rsv(fdt, re, 1, 0);
 }
 
 static int _fdt_resize_property(void *fdt, int nodeoffset, const char *name,