tomoyo: fix small typo

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Acked-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <james.morris@microsoft.com>

security/tomoyo/util.c

@@ -106,7 +106,7 @@ void tomoyo_convert_time(time64_t time64, struct tomoyo_time *stamp)
  * @string: String representation for permissions in foo/bar/buz format.
  * @keyword: Keyword to find from @string/
  *
- * Returns ture if @keyword was found in @string, false otherwise.
+ * Returns true if @keyword was found in @string, false otherwise.
  *
  * This function assumes that strncmp(w1, w2, strlen(w1)) != 0 if w1 != w2.
  */