make usbmuxd_send() return a negative errno value like specified in the docs
diff --git a/src/libusbmuxd.c b/src/libusbmuxd.c
index 613fd1c..f52a1c2 100644
--- a/src/libusbmuxd.c
+++ b/src/libusbmuxd.c
@@ -1060,7 +1060,8 @@
num_sent = send(sfd, (void*)data, len, 0);
if (num_sent < 0) {
*sent_bytes = 0;
- DEBUG(1, "%s: Error %d when sending: %s\n", __func__, num_sent, strerror(errno));
+ num_sent = errno;
+ DEBUG(1, "%s: Error %d when sending: %s\n", __func__, num_sent, strerror(num_sent));
return num_sent;
} else if ((uint32_t)num_sent < len) {
DEBUG(1, "%s: Warning: Did not send enough (only %d of %d)\n", __func__, num_sent, len);
