Fix intN vs. jsword leftover confusion in context-thread API.

js/src/jsapi.c

@@ -4173,15 +4173,15 @@ JS_GetContextThread(JSContext *cx)
 JS_PUBLIC_API(jsword)
 JS_SetContextThread(JSContext *cx)
 {
-    intN old = cx->thread;
+    jsword old = cx->thread;
     cx->thread = js_CurrentThreadId();
     return old;
 }
 
-JS_PUBLIC_API(intN)
+JS_PUBLIC_API(jsword)
 JS_ClearContextThread(JSContext *cx)
 {
-    intN old = cx->thread;
+    jsword old = cx->thread;
     cx->thread = 0;
     return old;
 }

js/src/jsapi.h

@@ -1745,7 +1745,7 @@ JS_GetContextThread(JSContext *cx);
 extern JS_PUBLIC_API(jsword)
 JS_SetContextThread(JSContext *cx);
 
-extern JS_PUBLIC_API(intN)
+extern JS_PUBLIC_API(jsword)
 JS_ClearContextThread(JSContext *cx);
 
 #endif /* JS_THREADSAFE */