fgets() calls without checking return

[ColinIanKing]

There are multiple calls to fgets() where the return from the function is not being checked for failure, for example:

get_hex_dword_from_path() has:

                fgets(buf, 64, fp);

                dword = strtol(buf, NULL, 16);

It's a good idea to check for failure, e.g.:

                if (fgets(buf, 64, fp)) {
                       dword = strtol(buf, NULL, 16);
                } else {
                        /* Do some error handling */
                }

The occasions that need fixing are:

/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_opr_mode’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:108:2: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  108 |  fgets(buf, 64, fp);
      |  ^~~~~~~~~~~~~~~~~~
/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_hex_dword_from_path’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:72:3: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   72 |   fgets(buf, 64, fp);
      |   ^~~~~~~~~~~~~~~~~~
/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_dword_from_path’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:90:3: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   90 |   fgets(buf, 64, fp);
      |   ^~~~~~~~~~~~~~~~~~
/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_cable_plug_type’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:172:2: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  172 |  fgets(buf, 64, fp);
      |  ^~~~~~~~~~~~~~~~~~
/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_cable_type’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:213:2: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  213 |  fgets(buf, 64, fp);
      |  ^~~~~~~~~~~~~~~~~~
/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_cable_mode_support’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:239:2: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  239 |  fgets(buf, 64, fp);
      |  ^~~~~~~~~~~~~~~~~~
/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_pd_rev’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:155:3: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  155 |   fgets(buf, 10, fp);
      |   ^~~~~~~~~~~~~~~~~~
/home/cking/repos/libtypec/libtypec_sysfs_ops.c: In function ‘get_bcd_from_rev_file’:
/home/cking/repos/libtypec/libtypec_sysfs_ops.c:137:3: warning: ignoring return value of ‘fgets’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  137 |   fgets(buf, 10, fp);

[Rajaram-Regupathy]

Fixed thanks