1.1.8: compile warnings

[kloczek]

It would be good to clean this :)

alsactl.c: In function 'main':
alsactl.c:345:3: warning: ignoring return value of 'daemon', declared with attribute warn_unused_result [-Wunused-result]
  345 |   daemon(0, 0);
      |   ^~~~~~~~~~~~
utils.c: In function 'initfailed':
utils.c:95:2: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
   95 |  write(fp, str, strlen(str));
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~
utils.c:96:2: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
   96 |  write(fp, ":", 1);
      |  ^~~~~~~~~~~~~~~~~
utils.c:97:2: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
   97 |  write(fp, reason, strlen(reason));
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
utils.c:98:2: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
   98 |  write(fp, ":", 1);
      |  ^~~~~~~~~~~~~~~~~
utils.c:99:2: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
   99 |  write(fp, sexitcode, strlen(sexitcode));
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
utils.c:100:2: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
  100 |  write(fp, "\n", 1);
      |  ^~~~~~~~~~~~~~~~~~
Note: Writing alsactl_init.7
mem.c: In function 'casprintf':
mem.c:63:6: warning: implicit declaration of function 'vasprintf'; did you mean 'casprintf'? [-Wimplicit-function-declaration]
   63 |  if (vasprintf(&str, fmt, ap) < 0)
      |      ^~~~~~~~~
      |      casprintf
utils.c:19: warning: "_XOPEN_SOURCE" redefined
   19 | #define _XOPEN_SOURCE
      | 
<command-line>: note: this is the location of the previous definition
volume_mapping.c: In function 'get_normalized_volume':
volume_mapping.c:116:15: warning: implicit declaration of function 'exp10' [-Wimplicit-function-declaration]
  116 |  normalized = exp10((value - max) / 6000.0);
      |               ^~~~~
volume_mapping.c:116:15: warning: incompatible implicit declaration of built-in function 'exp10'
volume_mapping.c: In function 'set_normalized_volume':
volume_mapping.c:151:14: warning: incompatible implicit declaration of built-in function 'exp10'
  151 |   min_norm = exp10((min - max) / 6000.0);
      |              ^~~~~
../alsamixer/volume_mapping.c: In function 'get_normalized_volume':
../alsamixer/volume_mapping.c:116:15: warning: implicit declaration of function 'exp10' [-Wimplicit-function-declaration]
  116 |  normalized = exp10((value - max) / 6000.0);
      |               ^~~~~
../alsamixer/volume_mapping.c:116:15: warning: incompatible implicit declaration of built-in function 'exp10'
../alsamixer/volume_mapping.c: In function 'set_normalized_volume':
../alsamixer/volume_mapping.c:151:14: warning: incompatible implicit declaration of built-in function 'exp10'
  151 |   min_norm = exp10((min - max) / 6000.0);
      |              ^~~~~
amidi.c: In function 'main':
amidi.c:692:5: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
  692 |     write(receive_file, buf, length);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
alsaloop.c: In function 'parse_config':
alsaloop.c:398:6: warning: variable 'arg_effect' set but not used [-Wunused-but-set-variable]
  398 |  int arg_effect = 0;
      |      ^~~~~~~~~~
aseqnet.c: In function 'flush_writebuf':
aseqnet.c:495:5: warning: ignoring return value of 'write', declared with attribute warn_unused_result [-Wunused-result]
  495 |     write(netfd[i], writebuf, cur_wrlen);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[perexg]

Fixed some in ade71cf and f8ce4f1 . Create another issue for leftovers..