nixpkgs/pkgs/applications/networking/browsers/firefox/fix-pa-context-connect-retval.patch

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Yep, it's a "return code was ignored" bug.
diff --git a/media/libcubeb/src/cubeb_pulse.c b/media/libcubeb/src/cubeb_pulse.c
index aaaaaaaaaaa..bbbbbbbbbbb 100644
--- a/media/libcubeb/src/cubeb_pulse.c
+++ b/media/libcubeb/src/cubeb_pulse.c
@@ -473,6 +473,8 @@
static int
pulse_context_init(cubeb * ctx)
{
+ int r;
+
if (ctx->context) {
assert(ctx->error == 1);
pulse_context_destroy(ctx);
@@ -486,9 +488,9 @@
WRAP(pa_context_set_state_callback)(ctx->context, context_state_callback, ctx);
WRAP(pa_threaded_mainloop_lock)(ctx->mainloop);
- WRAP(pa_context_connect)(ctx->context, NULL, 0, NULL);
+ r = WRAP(pa_context_connect)(ctx->context, NULL, 0, NULL);
- if (wait_until_context_ready(ctx) != 0) {
+ if (r < 0 || wait_until_context_ready(ctx) != 0) {
WRAP(pa_threaded_mainloop_unlock)(ctx->mainloop);
pulse_context_destroy(ctx);
ctx->context = NULL;