selftests: seccomp: Fix "performace" to "performance"

Fix misspelling reported by codespell

Signed-off-by: Sumanth Gavini <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Kees Cook <[e-mail]>

tools/testing/selftests/seccomp/seccomp_benchmark.c

···
 /*
  * Strictly speaking, this is not a test. But it can report during test
- * runs so relative performace can be measured.
+ * runs so relative performance can be measured.
  */
 #define _GNU_SOURCE
 #include <assert.h>