Input: iqs626a - replace snprintf() with scnprintf()

Input: iqs626a - replace snprintf() with scnprintf()

W=1 builds warn that the data written to 'tc_name' is truncated for
theoretical strings such as "channel-2147483646".

Solve this problem by replacing snprintf() with scnprintf() so that
the return value corresponds to what was actually written.

In practice, the largest string that will be written is "channel-8",
and the return value is not actually evaluated. Instead, this patch
ultimately removes the warning without unnecessarily increasing the
size of 'tc_name' from 10 bytes.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202412221136.0S4kRoCC-lkp@intel.com/
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/Z3rV8GTHxLyjBQ5I@nixie71
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>