eolian: fix use after free in eolian_database

'toscan' is actually a view to 'mpath' memory, so freeing it first
would result in use-after-free. This is obviously only in the error
branch so it usually does not happen, but fix anyway.

CID1403022

src/lib/eolian/eolian_database.c

@@ -1104,8 +1104,8 @@ eolian_state_file_path_parse(Eolian_State *state, const char *filepath)
 
    if (!eolian_state_directory_add(state, toscan))
      {
-        free(mpath);
         eolian_state_log(state, "could not scan directory '%s'", toscan);
+        free(mpath);
         return NULL;
      }
    unit = eolian_state_file_parse(state, fname);