Fix lint problems

Author: chrisseaton

lib/truffle/strscan.rb

@@ -39,7 +39,7 @@ class ScanError < StandardError
 end
 
 class StringScanner
-  
+
   Id = 'None$Id'.freeze
   Version = '1.0.0'.freeze
 
@@ -321,7 +321,7 @@ def scan_internal(pattern, advance_pos, getstr, headonly)
     # onwards, even if headonly is set. Instead, remove the ^. This could
     # possibly be fixed in Joni instead, or maybe there is already some option
     # we're not using.
-    
+
     if pattern.source[0] == '^' && pos > 0
       pattern = Regexp.new(pattern.source[1..-1])
       headonly = true

src/main/ruby/core/array.rb

@@ -1107,7 +1107,7 @@ def sample_many(count, rng)
       result.swap c, rng.rand(size)
     end
 
-    return count == size ? result : result[0, count]
+    count == size ? result : result[0, count]
   end
 
   private :sample_many

src/main/ruby/core/enumerable.rb

@@ -707,7 +707,7 @@ def min_max(relative)
         unless comp
           raise ArgumentError, "comparison of #{o.class} with #{chosen} failed"
         end
-        
+
         if (Comparable.compare_int(comp) <=> 0) == relative
           chosen = o
         end

src/main/ruby/core/io.rb

@@ -1435,7 +1435,7 @@ def read_to_separator
       end
 
       str << @buffer.shift
-      yield_string(str) { |s| yield s }
+      yield_string(str) { |y| yield y }
     end
 
     # method B, E

src/main/ruby/core/process.rb

@@ -862,7 +862,7 @@ module XID
     def re_exchangeable?
       true
     end
-    
+
     def sid_available?
       true
     end
@@ -921,7 +921,7 @@ def rid
   module GID
     class << self
       extend XID
-      
+
       def change_privilege(gid)
         gid = Truffle::Type.coerce_to gid, Integer, :to_int
 

src/main/ruby/core/struct.rb

@@ -201,7 +201,7 @@ def check_index_var(var)
     if var < -a_len
       raise IndexError, "offset #{var + a_len} too small for struct(size:#{a_len})"
     end
-    var = _attrs[var]
+    _attrs[var]
   end
 
   private :check_index_var