Added semicolons when setting main clock frequency to 2 MHz or 4 MHz

(cherry picked from commit d1737bc90765b5b12d1c47434eed5c91b88735e4)

Author: Bekken, Kristian_saxrud

cores/arduino/wiring.c

@@ -295,13 +295,13 @@ void init()
 		cpu_freq = 4000000;
 
 		/* Clock DIV4 */
-		_PROTECTED_WRITE(CLKCTRL_MCLKCTRLB, (CLKCTRL_PEN_bm | CLKCTRL_PDIV_4X_gc))
+		_PROTECTED_WRITE(CLKCTRL_MCLKCTRLB, (CLKCTRL_PEN_bm | CLKCTRL_PDIV_4X_gc));
 
 	#elif (F_CPU == 2000000)
 		cpu_freq = 2000000;
 
 		/* Clock DIV8 */
-		_PROTECTED_WRITE(CLKCTRL_MCLKCTRLB, (CLKCTRL_PEN_bm | CLKCTRL_PDIV_8X_gc))
+		_PROTECTED_WRITE(CLKCTRL_MCLKCTRLB, (CLKCTRL_PEN_bm | CLKCTRL_PDIV_8X_gc));
 	#else
 
 		#ifndef F_CPU