RPC: remove unneeded checks from xdr_truncate_encode()

Thanks to Andrea Arcangeli for pointing out these checks are
obviously unnecessary given the preceding calculations.
Reported-by: NAndrea Arcangeli <aarcange@redhat.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

net/sunrpc/xdr.c

@@ -617,7 +617,7 @@ void xdr_truncate_encode(struct xdr_stream *xdr, size_t len)
 	fraglen = min_t(int, buf->len - len, tail->iov_len);
 	tail->iov_len -= fraglen;
 	buf->len -= fraglen;
-	if (tail->iov_len && buf->len == len) {
+	if (tail->iov_len) {
 		xdr->p = tail->iov_base + tail->iov_len;
 		/* xdr->end, xdr->iov should be set already */
 		return;
@@ -631,7 +631,7 @@ void xdr_truncate_encode(struct xdr_stream *xdr, size_t len)
 	old = new + fraglen;
 	xdr->page_ptr -= (old >> PAGE_SHIFT) - (new >> PAGE_SHIFT);
 
-	if (buf->page_len && buf->len == len) {
+	if (buf->page_len) {
 		xdr->p = page_address(*xdr->page_ptr);
 		xdr->end = (void *)xdr->p + PAGE_SIZE;
 		xdr->p = (void *)xdr->p + (new % PAGE_SIZE);