silence solaris warning from missing braces (SFSIP-132)

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13369 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/sofia-sip/libsofia-sip-ua/su/su_uniqueid.c

@@ -84,7 +84,11 @@ union state {
 
 #include <pthread.h>
 
+#if defined(__sun)
+static pthread_once_t once = { PTHREAD_ONCE_INIT };
+#else
 static pthread_once_t once = PTHREAD_ONCE_INIT;
+#endif
 static int done_once = 1;
 static pthread_key_t state_key;