Fix memory leak in OTextInputStream.

Delete mpBuffer when done in destructor or replaced in implResizeBuffer.

Change-Id: Ide1b44f10a482ce9bb6135fb879e62e0a8ccea29
Reviewed-on: https://gerrit.libreoffice.org/4637Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

io/source/TextInputStream/TextInputStream.cxx

@@ -128,6 +128,8 @@ OTextInputStream::~OTextInputStream()
         rtl_destroyUnicodeToTextContext( mConvText2Unicode, mContextText2Unicode );
         rtl_destroyUnicodeToTextConverter( mConvText2Unicode );
     }
+
+    delete[] mpBuffer;
 }
 
 void OTextInputStream::implResizeBuffer( void )
@@ -135,6 +137,7 @@ void OTextInputStream::implResizeBuffer( void )
     sal_Int32 mnNewBufferSize = mnBufferSize * 2;
     sal_Unicode* pNewBuffer = new sal_Unicode[ mnNewBufferSize ];
     memcpy( pNewBuffer, mpBuffer, mnCharsInBuffer * sizeof( sal_Unicode ) );
+    delete[] mpBuffer;
     mpBuffer = pNewBuffer;
     mnBufferSize = mnNewBufferSize;
 }