Change libusb_init_option to fix libusb_set_option() on big-endian

libusb_set_option() is a variadic function, so the type of the arguments
is not clearly defined. When called with LIBUSB_OPTION_LOG_LEVEL, the
argument is read with va_arg() as an int, which matches the type used
when passing constants, and also most of the internal calls and the
calls in the examples.

However the internal call site in libusb_init_context() passes the ival
element of the libusb_init_option struct directly, which is of type
int64_t. This breaks on big-endian architectures like PowerPC, as
detected by tests/set_option.

Therefore change the libusb_init_option struct to use int here as well.

Thanks to Aurelien Jarno for reporting and initial patch.

Closes libusb#1416

Signed-off-by: Tormod Volden <[email protected]>

libusb/libusb.h

@@ -1538,7 +1538,7 @@ struct libusb_init_option {
   enum libusb_option option;
   /** An integer value used by the option (if applicable). */
   union {
-    int64_t ival;
+    int ival;
     libusb_log_cb log_cbval;
   } value;
 };