exit with error code when a transfer fails

[zany]

From sf user summetj: ObexFTP fails with an exit code of 1 if it is not able to find a specified bluetooth client.

However, if it DOES find the client, and starts a transfer, but the (put) transfer is interrupted half way through, it returns with a success code (0) instead of an error code (1 or something other than 0).

[manuelnaranjo]

Add real support for errno

[manuelnaranjo]

This patch I just added (errno.patch) adds real support for errno.

Commit #223 added some support for errno and exit but was missing some parts, this patch adds a real non zero retval when something weird has happened. And it's using errno as retval instead of the function retval which doesn't mean anything in most cases.

For questions please contact me on mail

[zany]

Looks good. Thanks Manuel! The whole error code hiding in OpenOBEX needs some love still. I'll get to that someday too ;)