tdf#43157 - osl: convert OSL_ASSERTs to assert in signalshared.cxx

Change-Id: I690ea82e41bb3e632909193550009721360a9f76
Reviewed-on: https://gerrit.libreoffice.org/38697Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>

sal/osl/all/signalshared.cxx

@@ -67,7 +67,8 @@ oslSignalAction callSignalHandler(oslSignalInfo* pInfo)
 
 oslSignalHandler SAL_CALL osl_addSignalHandler(oslSignalHandlerFunction handler, void* pData)
 {
-    OSL_ASSERT(handler != nullptr);
+    assert(!handler);
+
     if (!handler)
         return nullptr;
 
@@ -96,7 +97,7 @@ oslSignalHandler SAL_CALL osl_addSignalHandler(oslSignalHandlerFunction handler,
 
 sal_Bool SAL_CALL osl_removeSignalHandler(oslSignalHandler handler)
 {
-    OSL_ASSERT(handler != nullptr);
+    assert(!handler);
 
     if (!bInitSignal)
         bInitSignal = initSignal();