serial: pic32: don't zero members of kzalloc-ated structure

struct pic32_sport (sport) has just been kzallocated. So there is no
need to zero its member (sport->port) now.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220503063122.20957-10-jslaby@suse.cz


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>