Simplify.

Author: Gary Gregory

src/main/java/org/apache/commons/io/filefilter/RegexFileFilter.java

@@ -91,11 +91,7 @@ private static Pattern compile(final String pattern, final int flags) {
      * @return Pattern compilation flags.
      */
     private static int toFlags(final IOCase caseSensitivity) {
-        int flags = 0;
-        if (caseSensitivity != null && !caseSensitivity.isCaseSensitive()) {
-            flags = Pattern.CASE_INSENSITIVE;
-        }
-        return flags;
+        return caseSensitivity != null && !caseSensitivity.isCaseSensitive() ? Pattern.CASE_INSENSITIVE : 0;
     }
 
     /** The regular expression pattern that will be used to match file names. */