sesexec.c: In function ‘main’:
sesexec.c:521:1: error: control reaches end of non-void function [-Werror=return-type]
sound.c: In function ‘process_pcm_message’:
sound.c:1123:21: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int i = 0; i < send_silence_times; i++)
^
sound.c:1123:21: note: use option -std=c99 or -std=gnu99 to compile your code
These fixes are in line with our coding standard and have no functional change.