common: remove tal_check() call on libwally allocations.

We call it once at the end, but calling on each allocation is
excessive, and it shows when dealing with large PSBTS.  Testing a
700-input PSBT was unusably slow without this: after this the entire
test ran in 9 seconds.

Changelog-Fixed: JSON-RPC: Dealing with giant PSBTs (700 inputs!) is now much faster.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Author: rustyrussell

common/setup.c

@@ -11,7 +11,6 @@
 static void *cln_wally_tal(size_t size)
 {
 	assert(wally_tal_ctx);
-	assert(tal_check(wally_tal_ctx, "cln_wally_tal ctx check"));
 	return tal_arr_label(wally_tal_ctx, u8, size, "cln_wally_tal");
 }