ptrdiff_t length modifier for *scanf problem

[maska989]

During scanf tests there was a problem reading data assigned as ptrdiff_t ("%t*") .

• In testing fallowing branch was used https://github.com/phoenix-rtos/libphoenix/tree/astalke/RTOS-356

• To reproduce issue copy following code:

  
  #include <stdio.h>
  #include <stddef.h>
  #include <string.h> 
  #include <limits.h>

include

int main(void) { char str[125];

sprintf(str,"%td",PTRDIFF_MAX);

ptrdiff_t val;
ptrdiff_t val1;

printf("\n td = %s",str);

sscanf(str,"%td",&val);
printf("\nval with *td = %td",val);

sscanf("2147483647","%td",&val1);
printf("\nfinger val with *td = %td",val1);

sscanf("2147483647","%ld",&val1);
printf("\nfinger val with *ld = %ld",val1);

}

Outcome on Host-generic-pc  and ia32-generic-qemu:

![Screenshot from 2023-02-22 11-42-53](https://user-images.githubusercontent.com/49757239/220597260-c4b748d8-dd93-4eb5-89c4-18bc68df9c84.png)

[gerard5]

@maska989 the above pull-request should resolve this issue, please verify before merge:

[maska989]

@gerard5 After applying your pull-request everything works fine. Thanks.