Fix memory leak warning.

* nsfns.m (Fns_convert_utf8_nfd_to_nfc): Allocate and release pool to
remove memory leak warnings.

src/ChangeLog

 2013-08-11  Jan Djärv  <jan.h.d@swipnet.se>
 
+	* nsfns.m (Fns_convert_utf8_nfd_to_nfc): Allocate and release pool to
+	remove memory leak warnings.
+
 	* nsterm.m (menu_pending_title, ns_get_pending_menu_title): Remove.
 	(ns_check_menu_open): Handle menu == nil.  Remove assignment to
 	menu_pending_title.

src/nsfns.m

@@ -2035,13 +2035,17 @@ and GNUstep implementations ("distributor-specific release
 /* TODO: If GNUstep ever implements precomposedStringWithCanonicalMapping,
          remove this. */
   NSString *utfStr;
+  Lisp_Object ret;
 
   CHECK_STRING (str);
-  utfStr = [NSString stringWithUTF8String: SSDATA (str)];
+  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+ utfStr = [NSString stringWithUTF8String: SSDATA (str)];
 #ifdef NS_IMPL_COCOA
-    utfStr = [utfStr precomposedStringWithCanonicalMapping];
+  utfStr = [utfStr precomposedStringWithCanonicalMapping];
 #endif
-  return build_string ([utfStr UTF8String]);
+  ret = build_string ([utfStr UTF8String]);
+  [pool release];
+  return ret;
 }