fix rubocop Style/RedundantBegin cop

.rubocop_rubyzip.yml

@@ -250,11 +250,6 @@ Style/PercentLiteralDelimiters:
 Style/PredicateName:
   Enabled: false
 
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/RedundantBegin:
-  Enabled: false
-
 # Offense count: 3
 # Configuration parameters: MaxSlashes.
 Style/RegexpLiteral:

lib/zip/filesystem.rb

@@ -165,12 +165,10 @@ module Zip
       private :get_entry
 
       def unix_mode_cmp(fileName, mode)
-        begin
-          e = get_entry(fileName)
-          e.fstype == 3 && ((e.external_file_attributes >> 16) & mode ) != 0
-        rescue Errno::ENOENT
-          false
-        end
+        e = get_entry(fileName)
+        e.fstype == 3 && ((e.external_file_attributes >> 16) & mode ) != 0
+      rescue Errno::ENOENT
+        false
       end
       private :unix_mode_cmp