osl: Remember the last error before returning osl_Socket_Error

This prevents from e.g. com.sun.star.bridge.UnoUrlResolver's
emitting confusing messages, when trying to connect to a port
on which no LibreOffice process is listening, like:
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  __main__.NoConnectException: Connector : couldn't connect to socket (Success)
^^^^^^^
After applying this patch:
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  __main__.NoConnectException: Connector : couldn't connect to socket (Connection refused)

You can see the above behavior with the following python code:

import uno
x = uno.getComponentContext()
y = x.ServiceManager
z = y.createInstanceWithContext("com.sun.star.bridge.UnoUrlResolver", x)
url = "uno:socket,host=localhost,port=2002;urp;StarOffice.ComponentContext"
a = z.resolve(url)

... provided that no process is waiting on port 2002.

Change-Id: Id094cf9271fe77d84f2284d91a0e452448de2bc2
Reviewed-on: https://gerrit.libreoffice.org/52018
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

0 files changed, 0 insertions, 0 deletions