fixed errMessage fmt string

src/as/asLibRoutines.c

@@ -1159,7 +1159,7 @@ static ASG *asAsgAdd(char *asgName)
 		&& ellCount(&pnext->ruleList)==0)
 			return(pnext);
 	    }
-	    errMessage(S_asLib_dupAsg,NULL);
+	    errMessage(S_asLib_dupAsg,"asAsgAdd");
 	    return(NULL);
 	}
 	pnext = (ASG *)ellNext((ELLNODE *)pnext);

src/cas/generic/casEventMask.cc

@@ -92,7 +92,7 @@ casEventMask casEventRegistry::registerEvent ( const char *pName )
 	else {
 		mask = this->maskAllocator ();
 		if ( mask.mask == 0u ) {
-			errMessage ( S_cas_tooManyEvents, NULL );
+			errMessage ( S_cas_tooManyEvents, "casEventRegistry::registerEvent" );
 		}
 		else {
 			pEntry = new casEventMaskEntry ( *this, mask, pName );

src/cas/generic/casStrmClient.cc

@@ -949,7 +949,7 @@ caStatus casStrmClient::writeResponse (
 	caStatus status;
 
 	if ( completionStatus ) {
-		errMessage ( completionStatus, NULL );
+		errMessage ( completionStatus, "write failed" );
 		status = this->sendErrWithEpicsStatus ( guard, & msg, 
 				chan.getCID(), completionStatus, ECA_PUTFAIL );
 	}