Fix misplaced return statement

Author: LukasBreitwieser

cmake/modules/RootMacros.cmake

@@ -2123,8 +2123,8 @@ function (IS_SYSTEM_PATH path is_system_path)
   foreach (dir ${CMAKE_SYSTEM_PATH})
     if ("${path}" STREQUALS "$dir")
       set(${is_system_path} TRUE PARENT_SCOPE)
+      return()
     endif()
-    return()
   endforeach()
   set(${is_system_path} FALSE PARENT_SCOPE)
 endfunction()