LibDesktop: Collapse if-else in AppFile

Author: https://github.com/gmta
Commit: 0ec39aafb6
Pull-request: https://github.com/SerenityOS/serenity/pull/9203
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibDesktop/AppFile.cpp

@@ -124,11 +124,9 @@ bool AppFile::spawn() const
     if ((errno = posix_spawn(&child_pid, executable().characters(), nullptr, nullptr, const_cast<char**>(argv), environ))) {
         perror("posix_spawn");
         return false;
-    } else {
+    } else if (disown(child_pid) < 0) {
-        if (disown(child_pid) < 0) {
+        perror("disown");
-            perror("disown");
+        return false;
-            return false;
-        }
     }
 
     return true;