convert PROTOCOL macros from statements to (multiple, comma separated) expressions

Marlin/Marlin.h

@@ -51,22 +51,22 @@
   #define MYSERIAL MSerial
 #endif
 
-#define SERIAL_PROTOCOL(x) MYSERIAL.print(x);
-#define SERIAL_PROTOCOL_F(x,y) MYSERIAL.print(x,y);
-#define SERIAL_PROTOCOLPGM(x) serialprintPGM(PSTR(x));
-#define SERIAL_PROTOCOLLN(x) {MYSERIAL.print(x);MYSERIAL.write('\n');}
-#define SERIAL_PROTOCOLLNPGM(x) {serialprintPGM(PSTR(x));MYSERIAL.write('\n');}
+#define SERIAL_PROTOCOL(x) (MYSERIAL.print(x))
+#define SERIAL_PROTOCOL_F(x,y) (MYSERIAL.print(x,y))
+#define SERIAL_PROTOCOLPGM(x) (serialprintPGM(PSTR(x)))
+#define SERIAL_PROTOCOLLN(x) (MYSERIAL.print(x),MYSERIAL.write('\n'))
+#define SERIAL_PROTOCOLLNPGM(x) (serialprintPGM(PSTR(x)),MYSERIAL.write('\n'))
 
 
 const char errormagic[] PROGMEM ="Error:";
 const char echomagic[] PROGMEM ="echo:";
-#define SERIAL_ERROR_START serialprintPGM(errormagic);
+#define SERIAL_ERROR_START (serialprintPGM(errormagic))
 #define SERIAL_ERROR(x) SERIAL_PROTOCOL(x)
 #define SERIAL_ERRORPGM(x) SERIAL_PROTOCOLPGM(x)
 #define SERIAL_ERRORLN(x) SERIAL_PROTOCOLLN(x)
 #define SERIAL_ERRORLNPGM(x) SERIAL_PROTOCOLLNPGM(x)
 
-#define SERIAL_ECHO_START serialprintPGM(echomagic);
+#define SERIAL_ECHO_START (serialprintPGM(echomagic))
 #define SERIAL_ECHO(x) SERIAL_PROTOCOL(x)
 #define SERIAL_ECHOPGM(x) SERIAL_PROTOCOLPGM(x)
 #define SERIAL_ECHOLN(x) SERIAL_PROTOCOLLN(x)

Marlin/temperature.cpp

@@ -244,7 +244,7 @@ void PID_autotune(float temp, int extruder, int ncycles)
               Kp = 0.6*Ku;
               Ki = 2*Kp/Tu;
               Kd = Kp*Tu/8;
-              SERIAL_PROTOCOLLNPGM(" Clasic PID ")
+              SERIAL_PROTOCOLLNPGM(" Clasic PID ");
               SERIAL_PROTOCOLPGM(" Kp: "); SERIAL_PROTOCOLLN(Kp);
               SERIAL_PROTOCOLPGM(" Ki: "); SERIAL_PROTOCOLLN(Ki);
               SERIAL_PROTOCOLPGM(" Kd: "); SERIAL_PROTOCOLLN(Kd);