Directly use OUStringBuffer::indexOf

Change-Id: I455a7857294a136a515bb68cc8321ede0e5d1c85
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/101575
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
diff --git a/sdext/source/minimizer/informationdialog.cxx b/sdext/source/minimizer/informationdialog.cxx
index d4a489c..8ab6ddf 100644
--- a/sdext/source/minimizer/informationdialog.cxx
+++ b/sdext/source/minimizer/informationdialog.cxx
@@ -191,7 +191,7 @@ static OUString ImpValueOfInMB( sal_Int64 rVal )
    fVal /= ( 1 << 20 );
    fVal += 0.05;
    OUStringBuffer aVal( OUString::number( fVal ) );
    sal_Int32 nX( OUString( aVal.getStr() ).indexOf( '.' ) );
    sal_Int32 nX( aVal.indexOf( '.' ) );
    if ( nX > 0 )
        aVal.setLength( nX + 2 );
    return aVal.makeStringAndClear();
diff --git a/sdext/source/minimizer/optimizerdialogcontrols.cxx b/sdext/source/minimizer/optimizerdialogcontrols.cxx
index a7e139c..13fe926 100644
--- a/sdext/source/minimizer/optimizerdialogcontrols.cxx
+++ b/sdext/source/minimizer/optimizerdialogcontrols.cxx
@@ -581,7 +581,7 @@ static OUString ImpValueOfInMB( sal_Int64 rVal, sal_Unicode nSeparator )
    fVal /= ( 1 << 20 );
    fVal += 0.05;
    OUStringBuffer aVal( OUString::number( fVal ) );
    sal_Int32 nX( OUString( aVal.getStr() ).indexOf( '.' ) );
    sal_Int32 nX( aVal.indexOf( '.' ) );
    if ( nX >= 0 )
    {
        aVal.setLength( nX + 2 );