(#17) Fix type conversion

s1hofmann · s1hofmann · commit 162d7c4f62bb · 2020-08-07T00:13:05.000+02:00
diff --git a/src/linux/window_manager.cc b/src/linux/window_manager.cc
@@ -14,7 +14,7 @@ WindowHandle getActiveWindow() {
         XCloseMainDisplay();
         return window;
     }
-    return NULL;
+    return -1;
 }
 
 std::vector<WindowHandle> getWindows() {

Original file line number	Diff line number	Diff line change
`@@ -14,7 +14,7 @@ WindowHandle getActiveWindow() {`
`14`	`14`	`XCloseMainDisplay();`
`15`	`15`	`return window;`
`16`	`16`	`}`
`17`		`- return NULL;`
	`17`	`+ return -1;`
`18`	`18`	`}`
`19`	`19`
`20`	`20`	`std::vector<WindowHandle> getWindows() {`