Revert "vcc: Add missing ERRCHK to vcc_expr5()"

This reverts commit 2bc56a4b.

We already assert that sym is not null, and we certainly don't expect a
reserved symbol to have slipped through since we already attempted the
least specific symnbol lookup.

This is not a case where we expect to fail because of user input.

lib/libvcc/vcc_expr.c

@@ -745,7 +745,6 @@ vcc_expr5(struct vcc *tl, struct expr **e, vcc_type_t fmt)
 		if (sym == NULL && fmt->global_pfx != NULL && t1->tok != '.') {
 			sym = VCC_SymbolGet(tl, SYM_MAIN, SYM_NONE,
 			    SYMTAB_CREATE, XREF_REF);
-			ERRCHK(tl);
 			AN(sym);
 			VCC_GlobalSymbol(sym, fmt);
 		}