Make SAL_LOG_FILE work on Windows also without logging.ini

...as used by solenv/gbuild/UITest.mk

Change-Id: Iefc1c1dc2f775c6872a5075a16e049f00d60273a
Reviewed-on: https://gerrit.libreoffice.org/50618Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

sal/osl/all/log.cxx

@@ -163,8 +163,6 @@ std::ofstream * getLogFile() {
     static char logFilePath[INI_STRINGBUF_SIZE];
     if (getValueFromLoggingIniFile("LogFilePath", logFilePath))
         logFile = logFilePath;
-    else
-        return nullptr;
 #endif
 
     // stays until process exits