fixed proper deletion of temp files on error

alib2measurepp/src/provisioner/MeasurementProvisionerUtils.cpp

@@ -49,8 +49,10 @@ MPUtils::ShmFileHandle MPUtils::openShmFile ( ) {
 	filename = "/dev/shm" + filename;
-	if ( access ( filename.c_str ( ), F_OK ) == -1 )
+	if ( access ( filename.c_str ( ), F_OK ) == -1 ) {
+		shm_unlink ( filename.c_str ( ) );
 		throw::exception::CommonException ( "MPUtils: can't create shm file in: " + filename );
+	}
 	return {
 			   shmFd, std::move ( filename )