[Nut-upsdev] Small memory leak in libusb.c

[Schmier, Jacob]

I noticed a small ( < 1k ) memory leak in libusb.c's libusb_open.  When
retrieving the descriptor information, strdup is used to set the
Vendor/Product/Serial strings for the current device.  The memory
allocated by strdup is not deallocated in subsequent iterations of the
loop.  The leak is quite small and really isn't a huge problem.  I
believe that the attached patch should correct this.

Jacob Schmier 
 
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