patchdir: avoid -Wdiscarded-qualifiers in remove_path()

> When building with glibc-2.43 there is the following warning:
>
>     dir.c:3526:15: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
>      3526 |         slash = strrchr(name, '/');
>           |               ^
>
> In this case we use a non-const pointer to get the last slash of the
> unwritable file name, and then use it again to write in the strdup'd
> file name.
>
> We can avoid this warning and make the code a bit more clear by using a
> separate variable to access the original argument and it's strdup'd
> copy.

>
> Signed-off-by: Collin Funk <collin.funk1@gmail.com>
> ---
>  dir.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

> diff --git a/dir.c b/dir.c
> index 026d8516a9..fcb8f6dd2a 100644
> --- a/dir.c
> +++ b/dir.c
> @@ -3518,15 +3518,15 @@ int get_sparse_checkout_patterns(struct pattern_list *pl)
>  
>  int remove_path(const char *name)
>  {
> -	char *slash;
> +	const char *last;
>  
>  	if (unlink(name) && !is_missing_file_error(errno))
>  		return -1;
>  
> -	slash = strrchr(name, '/');
> -	if (slash) {
> +	last = strrchr(name, '/');
> +	if (last) {
>  		char *dirs = xstrdup(name);
> -		slash = dirs + (slash - name);
> +		char *slash = dirs + (last - name);
>  		do {
>  			*slash = '\0';
>  			if (startup_info->original_cwd &&

> Collin Funk <collin.funk1@gmail.com> writes:
>
>> When building with glibc-2.43 there is the following warning:
>>
>>     dir.c:3526:15: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
>>      3526 |         slash = strrchr(name, '/');
>>           |               ^
>>
>> In this case we use a non-const pointer to get the last slash of the
>> unwritable file name, and then use it again to write in the strdup'd
>> file name.
>>
>> We can avoid this warning and make the code a bit more clear by using a
>> separate variable to access the original argument and it's strdup'd
>> copy.
>
> "it's" -> "its", if I am reading the above correctly?