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sixel: do not allocate anything in init besides sixel-output type

--- a/sixel.c

+++ b/sixel.c

@@ -56,6 +56,8 @@

 		lerrorf(ArgError, "invalid number of colors: %d", numcolors);

 	value_t v = cvalue(fsotype, sizeof(fso_t));

 	fso_t *f = value2c(fso_t*, v);

+	if(salloc == nil)

+		sixel_allocator_new(&salloc, malloc, calloc, realloc, free);

 	SIXELSTATUS r = sixel_output_new(&f->out, fso_write, f, salloc);

 	if(SIXEL_FAILED(r))

 		lerrorf(IOError, "could not create sixel output");

@@ -255,5 +257,4 @@

 {

 	fsosym = symbol("sixel-output");

 	fsotype = define_opaque_type(fsosym, sizeof(fso_t), &fso_vtable, nil);

-	sixel_allocator_new(&salloc, malloc, calloc, realloc, free);

 }