ppp: deflate: Remove useless call "zlib_inflateEnd"

Fix the following whitescan warning:

Calling "zlib_inflateEnd(&state->strm)" is only useful for its return
value, which is ignored.

Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Jiapeng Chong <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ppp/ppp_deflate.c

···
 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
 
 	if (state) {
-		zlib_inflateEnd(&state->strm);
 		vfree(state->strm.workspace);
 		kfree(state);
 	}