Reindent in a style similar to the one used by the OCaml compiler

indent -kr -i2

src/WiringPi_stubs.c

@@ -9,7 +9,8 @@
 #include <wiringPi.h>
 #include <wiringShift.h>
 
-value caml_hello(value unit) {
+value caml_hello(value unit)
+{
   CAMLparam1(unit);
   printf("Hello world!\n");
   CAMLreturn(Val_unit);