Removing invalid characters from Makefile

Makefile

@@ -53,17 +53,17 @@ else
 			DFU_RST=./STM32F10X_Lib/utils/linux64/upload-reset
 			DFU_UTIL=./STM32F10X_Lib/utils/linux64/dfu-util
 			ST_FLASH=./STM32F10X_Lib/utils/linux64/st-flash
-			STM32FLASH=./STM32F10X_Lib/utils/linux64/stm32flash	
+			STM32FLASH=./STM32F10X_Lib/utils/linux64/stm32flash
     	else ifeq ($(shell uname -m),armv7l)
 			DFU_RST=./STM32F10X_Lib/utils/rpi32/upload-reset
 			DFU_UTIL=./STM32F10X_Lib/utils/rpi32/dfu-util
 			ST_FLASH=./STM32F10X_Lib/utils/rpi32/st-flash
-			STM32FLASH=./STM32F10X_Lib/utils/rpi32/stm32flash	
+			STM32FLASH=./STM32F10X_Lib/utils/rpi32/stm32flash
 		else
 			DFU_RST=./STM32F10X_Lib/utils/linux/upload-reset
 			DFU_UTIL=./STM32F10X_Lib/utils/linux/dfu-util
 			ST_FLASH=./STM32F10X_Lib/utils/linux/st-flash
-			STM32FLASH=./STM32F10X_Lib/utils/linux/stm32flash		
+			STM32FLASH=./STM32F10X_Lib/utils/linux/stm32flash
     	endif
     endif
 
@@ -71,7 +71,7 @@ else
 		DFU_RST=./STM32F10X_Lib/utils/macosx/upload-reset
 		DFU_UTIL=./STM32F10X_Lib/utils/macosx/dfu-util
 		ST_FLASH=./STM32F10X_Lib/utils/macosx/st-flash
-		STM32FLASH=./STM32F10X_Lib/utils/macosx/stm32flash	
+		STM32FLASH=./STM32F10X_Lib/utils/macosx/stm32flash
     endif
 endif