Fix a couple of doubled semicolons

Marlin/temperature.cpp

@@ -1006,7 +1006,7 @@ void tp_init() {
   void start_watching_heater(int e) {
     if (degHotend(e) < degTargetHotend(e) - (WATCH_TEMP_INCREASE + TEMP_HYSTERESIS + 1)) {
       watch_target_temp[e] = degHotend(e) + WATCH_TEMP_INCREASE;
-      watch_heater_next_ms[e] = millis() + WATCH_TEMP_PERIOD * 1000;;
+      watch_heater_next_ms[e] = millis() + WATCH_TEMP_PERIOD * 1000;
     }
     else
       watch_heater_next_ms[e] = 0;

Marlin/ultralcd_implementation_hitachi_HD44780.h

@@ -396,7 +396,7 @@ char lcd_printPGM(const char* str) {
 }
 
 char lcd_print(char* str) {
-  char c, n = 0;;
+  char c, n = 0;
   unsigned char i = 0;
   while ((c = str[i++])) n += charset_mapper(c);
   return n;