Fix for vst2 plugins that crash on init

Signed-off-by: falkTX <falktx@falktx.com>

source/backend/plugin/CarlaPluginVST2.cpp

@@ -24,6 +24,7 @@
 
 #include "CarlaBackendUtils.hpp"
 #include "CarlaMathUtils.hpp"
+#include "CarlaProcessUtils.hpp"
 #include "CarlaScopeUtils.hpp"
 #include "CarlaVstUtils.hpp"
 
@@ -2418,9 +2419,13 @@ public:
         sCurrentUniqueId     = static_cast<intptr_t>(uniqueId);
         sLastCarlaPluginVST2 = this;
 
-        try {
-            fEffect = vstFn(carla_vst_audioMasterCallback);
-        } CARLA_SAFE_EXCEPTION_RETURN("Vst init", false);
+        {
+            const ScopedAbortCatcher sac;
+
+            try {
+                fEffect = vstFn(carla_vst_audioMasterCallback);
+            } CARLA_SAFE_EXCEPTION_RETURN("Vst init", false);
+        }
 
         sLastCarlaPluginVST2 = nullptr;
         sCurrentUniqueId     = 0;

source/utils/CarlaProcessUtils.cpp

@@ -33,7 +33,7 @@ ScopedAbortCatcher::ScopedAbortCatcher()
 ScopedAbortCatcher::~ScopedAbortCatcher()
 {
 #ifndef CARLA_OS_WIN
-    if (! s_triggered)
+    if (s_oldsig != nullptr && ! s_triggered)
         std::signal(SIGABRT, s_oldsig);
 #endif
 }