Fix off-by-one error: The XCollection loop index is one-based

We must compare the index against the number of entries with '>' and
not '>='.

Change-Id: I2de9e53b2a0d923d4136ee5e093baa955c8301da
Reviewed-on: https://gerrit.libreoffice.org/55405Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tor Lillqvist <tml@collabora.com>

extensions/source/ole/unoobjw.cxx

@@ -2069,7 +2069,7 @@ public:
         ULONG nReturned = 0;
         while (nLeft > 0)
         {
-            if (mnIndex >= mxCollection->getCount())
+            if (mnIndex > mxCollection->getCount())
             {
                 SAL_INFO("extensions.olebridge", this << "@CXEnumVariant::Next(" << celt << "): got " << nReturned << ": S_FALSE");
                 return S_FALSE;
@@ -2104,7 +2104,7 @@ public:
         ULONG nSkipped = 0;
         while (celt > 0)
         {
-            if (mnIndex >= mxCollection->getCount())
+            if (mnIndex > mxCollection->getCount())
             {
                 SAL_INFO("extensions.olebridge", this << "@CXEnumVariant::Skip(" << celt << "): skipped " << nSkipped << ": S_FALSE");
                 return S_FALSE;