minor perf issue

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1898091 13f79535-47bb-0310-9956-ffa450edef68

poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFCell.java

@@ -297,7 +297,8 @@ public final class XSSFCell extends CellBase {
                 rt = new XSSFRichTextString("");
                 break;
             case STRING:
-                if (_cell.getT() == STCellType.INLINE_STR) {
+                STCellType.Enum xmlbeanCellType = _cell.getT();
+                if (xmlbeanCellType == STCellType.INLINE_STR) {
                     if(_cell.isSetIs()) {
                         //string is expressed directly in the cell definition instead of implementing the shared string table.
                         rt = new XSSFRichTextString(_cell.getIs());
@@ -307,7 +308,7 @@ public final class XSSFCell extends CellBase {
                     } else {
                         rt = new XSSFRichTextString("");
                     }
-                } else if (_cell.getT() == STCellType.STR) {
+                } else if (xmlbeanCellType == STCellType.STR) {
                     //cached formula value
                     rt = new XSSFRichTextString(_cell.isSetV() ? _cell.getV() : "");
                 } else {