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The get_usb_string call is rather expensive on some USB devices, so we cache the vendor/product strings for future lookups (e.g. when hid_enumerate is invoked again later). This way, we only need to ask libusb for strings for devices we haven't seen since before we started. Signed-off-by: Steven Noonan <steven@valvesoftware.com> Signed-off-by: Sam Lantinga <slouken@libsdl.org>