main: Fix unnecessary return value from ‘file_storage’
Motivation:
- Currently, ‘file_storage_get_basestore_for_username()’ function always returns 0.
- It is not necessary to have error-handling routine immediately after calling the function.
- Also, it would be better to replace ‘0’ with meaningful value and remove needless error-handling routine.
Modification:
- Change the return value; from ’0’ to ‘basestore’ path information.
- Remove error-handling routine immediately after the above function
- The path info that is originally from g_build_filename() doesn’t need to handle error condition.