USB: DWC3: gadget: Fix compilation error in gadget.c

Initialize local variable to zero to fix the compilation error
of uninitialized variable.

Change-Id: Ia23a0239228fb0c2c8d7dff5daee0701c178f82a
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>
1 file changed