Bug 948686 - Remove unused variable declaration. r=njn

xpcom/base/nsMemoryReporterManager.cpp

@@ -1416,7 +1416,6 @@ nsMemoryReporterManager::GetExplicit(int64_t* aAmount)
 #ifndef HAVE_JEMALLOC_STATS
     return NS_ERROR_NOT_AVAILABLE;
 #else
-    bool more;
 
     // For each reporter we call CollectReports and filter out the
     // non-explicit, non-NONHEAP measurements (except for "heap-allocated").