msi: Fix a couple of leaks (coverity)

[Hans Leidekker]

On Fri, 2012-11-16 at 11:50 +0100, Frédéric Delanoy wrote:
> diff --git a/dlls/msi/files.c b/dlls/msi/files.c
> index 11913ef..98d7513 100644
> --- a/dlls/msi/files.c
> +++ b/dlls/msi/files.c
> @@ -336,6 +336,7 @@ UINT ACTION_InstallFiles(MSIPACKAGE *package)
>          if (rc != ERROR_SUCCESS)
>          {
>              ERR("Unable to load media info for %s (%u)\n", debugstr_w(file->File), rc);
> +            msi_free(mi);
>              return ERROR_FUNCTION_FAILED; 

This is a loop, so you should instead call msi_free_media_info to also
free any strings allocated in a previous call to msi_load_media_info.