lavf/ftp: check for truncation in snprintf
Silences e.g. the following warning in gcc 10: src/libavformat/ftp.c: In function ‘ftp_move’: src/libavformat/ftp.c:1122:46: warning: ‘%s’ directive output may be truncated writing up to 4095 bytes into a region of size 4091 [-Wformat-truncation=] 1122 | snprintf(command, sizeof(command), "RNTO %s\r\n", path); | ^~ ~~~~ src/libavformat/ftp.c:1122:5: note: ‘snprintf’ output between 8 and 4103 bytes into a destination of size 4096 1122 | snprintf(command, sizeof(command), "RNTO %s\r\n", path); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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