RTEMS | cpukit/libmisc/shell:fix command df overflow (!210)

[xiaojun zheng (@zhengxiaojun)]

xiaojun zheng commented on a discussion on cpukit/libmisc/shell/main_df.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/210#note_112043

 >  
 >    struct statvfs svfs;
 >    int code;
 > -  char f_buf[16], u_buf[16], a_buf[16];
 > +  char f_buf[20], u_buf[20], a_buf[20];

I think gcc considers `block_size` to be a 64-bit number, and be written to a buffer, the buffer size is less than the biggest length, so gcc throw out a warnning. Since the maximum number after the conversion is less than `16777216T`, I think `block_size` can be force to uint32_t when write to buffer, and increase buffer size is not necessary.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/210#note_112043
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