Fix compiler warning in QgsMeshDatasetGroupStore::readXml() #43304
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```
/home/even/qgis/qgis/src/core/mesh/qgsmeshdatasetgroupstore.cpp: In member function ‘void QgsMeshDatasetGroupStore::readXml(const QDomElement&, const QgsReadWriteContext&)’:
/home/even/qgis/qgis/src/core/mesh/qgsmeshdatasetgroupstore.cpp:329:29: warning: ‘sourceIndex’ may be used uninitialized in this function [-Wmaybe-uninitialized]
329 | mRegistery[globalIndex] = DatasetGroup{source, sourceIndex};
```
Introduced in 7a1c29d, so master only
vcloarec
approved these changes
May 20, 2021
nyalldawson
approved these changes
May 20, 2021
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Introduced in 7a1c29d, so master only