fix whitespace and register name typo

Author: jefftenney

portable/GCC/ARM_CM4F/port.c

@@ -103,7 +103,7 @@ configuration register. */
 	#define portNVIC_SYSTICK_CLK_BIT_SETTING	( portNVIC_SYSTICK_CLK_BIT )
 #else
 	/* Select the option to clock SysTick not at the same frequency as the core.
-    The clock used is often a divided version of the core clock. */
+	The clock used is often a divided version of the core clock. */
 	#define portNVIC_SYSTICK_CLK_BIT_SETTING	( 0 )
 #endif
 
@@ -680,7 +680,7 @@ void xPortSysTickHandler( void )
 			portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
 			#if( portNVIC_SYSTICK_CLK_BIT_SETTING != portNVIC_SYSTICK_CLK_BIT )
 			{
-				portNVIC_SYSTICK_LOAD_REG = portNVIC_SYSTICK_CLK_BIT_SETTING | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
+				portNVIC_SYSTICK_CTRL_REG = portNVIC_SYSTICK_CLK_BIT_SETTING | portNVIC_SYSTICK_INT_BIT | portNVIC_SYSTICK_ENABLE_BIT;
 			}
 			#endif /* portNVIC_SYSTICK_CLK_BIT_SETTING */
 			portNVIC_SYSTICK_LOAD_REG = ulTimerCountsForOneTick - 1UL;