ASV: excel asv occasional failure

closes pandas-dev#19779

Author: jreback

asv_bench/benchmarks/io/excel.py

@@ -25,13 +25,12 @@ def setup(self, engine):
         self.writer_read.save()
         self.bio_read.seek(0)
 
-        self.bio_write = BytesIO()
-        self.bio_write.seek(0)
-        self.writer_write = ExcelWriter(self.bio_write, engine=engine)
-
     def time_read_excel(self, engine):
         read_excel(self.bio_read)
 
     def time_write_excel(self, engine):
-        self.df.to_excel(self.writer_write, sheet_name='Sheet1')
-        self.writer_write.save()
+        bio_write = BytesIO()
+        bio_write.seek(0)
+        writer_write = ExcelWriter(bio_write, engine=engine)
+        self.df.to_excel(writer_write, sheet_name='Sheet1')
+        writer_write.save()