Adjust ReleaseReference() to also return the previous ref count as

AcquireReference() now does, and adjust all callers that relied on the previous
return type.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42091 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/shared/Referenceable.h

@@ -17,9 +17,10 @@ public:
 								BReferenceable();
 	virtual						~BReferenceable();
 
+								// acquire and release return
+								// the previous ref count
 			int32				AcquireReference();
-			bool				ReleaseReference();
-									// returns true after last
+			int32				ReleaseReference();
 
 			int32				CountReferences() const
 									{ return fReferenceCount; }