classicladder/serial_linux: Fix code ident
classicladder/serial_linux: Fix code ident

This fixes the following compiler warning:

hal/classicladder/serial_linux.c: In function ‘SerialReceive’:
hal/classicladder/serial_linux.c:237:3: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
   if ( ModbusDebugLevel>=2 )
   ^~
hal/classicladder/serial_linux.c:239:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’
    NbrCarsReceived = read(fd,Buff,MaxBuffLength);
    ^~~~~~~~~~~~~~~

mhaberler/machinekit,ArcEye/MK-Qt5,ArcEye/MK-Qt5,ArcEye/MK-Qt5,mhaberler/machinekit,strahlex/machinekit,strahlex/machinekit,strahlex/machinekit,mhaberler/machinekit,mhaberler/machinekit,ArcEye/MK-Qt5,mhaberler/machinekit,ArcEye/MK-Qt5,mhaberler/machinekit,strahlex/machinekit,strahlex/machinekit,ArcEye/MK-Qt5,strahlex/machinekit,strahlex/machinekit,ArcEye/MK-Qt5,mhaberler/machinekit,ArcEye/MK-Qt5,mhaberler/machinekit