HBASE-28599 RowTooBigException is thrown when duplicate increment RPC…

… call is attempted (#5927)

The root cause is analyzed by Robin Infant A(robiee17)

Signed-off-by: Duo Zhang <zhangduo@apache.org>
(cherry picked from commit dba7dcc)

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java

@@ -4036,7 +4036,7 @@ private static Get toGet(final Mutation mutation) throws IOException {
       assert mutation instanceof Increment || mutation instanceof Append;
       Get get = new Get(mutation.getRow());
       CellScanner cellScanner = mutation.cellScanner();
-      while (!cellScanner.advance()) {
+      while (cellScanner.advance()) {
         Cell cell = cellScanner.current();
         get.addColumn(CellUtil.cloneFamily(cell), CellUtil.cloneQualifier(cell));
       }