staging/emxx_udc: Remove pointless variable assignments

staging/emxx_udc: Remove pointless variable assignments

In a number of places in emxx_udc.c, there are variables which are
assigned to without that value ever being used. Remove these pointless
assignments.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 33aa8d45a4fe ("staging: emxx_udc: Add Emma Mobile USB Gadget driver")
Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
Link: https://lore.kernel.org/r/20200902154628.283453-1-alex.dewar90@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>