nixpkgs/pkgs/tools/audio/alsaequal/false_error.patch

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--- ./ctl_equal.c
+++ ./ctl_equal.c
@@ -263,8 +263,8 @@
for(i = 0; i < equal->num_input_controls; i++) {
if(equal->control_data->control[i].type == LADSPA_CNTRL_INPUT) {
index = equal->control_data->control[i].index;
- if(equal->klass->PortDescriptors[index] !=
- (LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL)) {
+ if(equal->klass->PortDescriptors[index] &
+ (LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL) == 0) {
SNDERR("Problem with control file %s, %d.", controls, index);
return -1;
}