Update src/stdlib_hashmap_open.f90

Co-authored-by: Jeremie Vandenplas <jeremie.vandenplas@gmail.com>

Author: chuckyvt

src/stdlib_hashmap_open.f90

@@ -841,7 +841,7 @@ module subroutine set_other_open_data( map, key, other, exists )
             end if
         else if ( associated( map % inverse(inmap) % target ) ) then
             associate( target => map % inverse(inmap) % target )
-                target % other = other
+              target % other = other
               if ( present(exists) ) exists = .true.
               return
             end associate