Return value 0 from connect() is not an error, errno is not set

No need to SAL_WARN it, it is a common non-exceptional case (when attempting
to start a second LO instance).

Change-Id: I26f2939d2f5b97ddfcc9e912e578b706567b3912

sal/osl/unx/pipe.cxx

@@ -260,7 +260,6 @@ oslPipe SAL_CALL osl_psz_createPipe(const sal_Char *pszPipeName, oslPipeOptions
         {
             if ( connect(pPipe->m_Socket, reinterpret_cast<sockaddr *>(&addr), len) >= 0 )
             {
-                SAL_WARN("sal.osl.pipe", "connect() failed: " << strerror(errno));
                 close (pPipe->m_Socket);
                 __osl_destroyPipeImpl(pPipe);
                 return NULL;