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 <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ppp/ppp_deflate.c

@@ -279,7 +279,6 @@ static void z_decomp_free(void *arg)
 	struct ppp_deflate_state *state = (struct ppp_deflate_state *) arg;
 
 	if (state) {
-		zlib_inflateEnd(&state->strm);
 		vfree(state->strm.workspace);
 		kfree(state);
 	}