ASoC: sdw_utils: Remove dead code in asoc_sdw_ti_add_tac5xx2_routes()

ASoC: sdw_utils: Remove dead code in asoc_sdw_ti_add_tac5xx2_routes()

Remove unnecessary checks for scnprintf() return values in
asoc_sdw_ti_add_tac5xx2_routes(). The function scnprintf() never
returns negative values and cannot return zero given the format
strings used ("%s SPK_L" and "%s SPK_R").

The existing length validation at line 110 already ensures that
name_prefix won't cause buffer overflow, and scnprintf() guarantees
null-termination even in case of truncation.

Fixes: e812de61e9a0 ("ASoC: sdw_utils: TI amp utility for tac5xx2 family")
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/linux-sound/agF8GBcHYUaGJbXY@stanley.mountain/
Signed-off-by: Niranjan H Y <niranjan.hy@ti.com>
Link: https://patch.msgid.link/20260513015542.2420-1-niranjan.hy@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>