osl: for should be a while

Change-Id: Id4e92f0c7927bbc767061461361936dbad8da778
Reviewed-on: https://gerrit.libreoffice.org/39204Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>

sal/osl/unx/file.cxx

@@ -605,7 +605,7 @@ oslFileError FileHandle_Impl::readLineAt(
     size_t bufpos = nOffset - m_bufptr, curpos = bufpos, dstpos = 0;
     int state = (bufpos >= m_buflen) ? LINE_STATE_LF : LINE_STATE_BEGIN;
 
-    for ( ; state != LINE_STATE_LF; )
+    while (state != LINE_STATE_LF)
     {
         if (curpos >= m_buflen)
         {