platform/x86/intel-uncore-freq: avoid non-literal format string

platform/x86/intel-uncore-freq: avoid non-literal format string

Using a string variable in place of a format string causes a W=1 build warning:

drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c:61:40: error: format string is not a string literal (potentially insecure) [-Werror,-Wformat-security]
   61 |                 length += sysfs_emit_at(buf, length, agent_name[agent]);
      |                                                      ^~~~~~~~~~~~~~~~~

Use the safer "%s" format string to print it instead.

Fixes: b98fa870fce2 ("platform/x86/intel-uncore-freq: Add attributes to show agent types")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://lore.kernel.org/r/20250610093459.2646337-1-arnd@kernel.org
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>