usb: avoid NULL check before free
The free() function checks if the argument is NULL.
Do not duplicate this check.
Signed-off-by: 
Heinrich Schuchardt <xypron.glpk@gmx.de>
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The free() function checks if the argument is NULL.
Do not duplicate this check.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>