filter_data_show.c: check dest buffer sizes

filter_data_show.c: check dest buffer sizes

Fixes Coverity CID 709413: Copy into fixed size buffer (STRING_OVERFLOW)
You might overrun the 512 byte fixed-size string "temp" by copying "profile" without checking the length.
 58                        strcpy( temp, profile );

and

CID 709414: Copy into fixed size buffer (STRING_OVERFLOW)
You might overrun the 512 byte fixed-size string "result" by copying "metavalue" without checking the length.
225                                                                        strcat( result, metavalue ? metavalue : "-" );