get rid of ambiguous parentheses warnings

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56937 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/matrix/lup_decomposition.rb

@@ -64,7 +64,7 @@ class Matrix
 
     # Returns +true+ if +U+, and hence +A+, is singular.
 
-    def singular? ()
+    def singular?
       @column_count.times do |j|
         if (@lu[j][j] == 0)
           return true

sample/cbreak.rb

@@ -5,11 +5,11 @@ ECHO = 0x00000008
 TIOCGETP = 0x40067408
 TIOCSETP = 0x80067409
 
-def cbreak ()
+def cbreak
   set_cbreak(true)
 end
 
-def cooked ()
+def cooked
   set_cbreak(false)
 end