Minor

src/modbus-data.c

@@ -31,7 +31,7 @@
   #include <libkern/OSByteOrder.h>
   #define bswap_16 OSSwapInt16
   #define bswap_32 OSSwapInt32
-	#define bswap_64 OSSwapInt64
+   #define bswap_64 OSSwapInt64
 #endif
 
 #if defined(__GNUC__)