selftests: breakpoints: Fix a typo of function name

commit-author Masami Hiramatsu <mhiramat@kernel.org>
commit 5b06eea

Since commit 5821ba9 ("selftests: Add test plan API to kselftest.h
and adjust callers") accidentally introduced 'a' typo in the front of
run_test() function, breakpoint_test_arm64.c became not able to be
compiled.

Remove the 'a' from arun_test().

Fixes: 5821ba9 ("selftests: Add test plan API to kselftest.h and adjust callers")
        Reported-by: Jun Takahashi <takahashi.jun_s@aa.socionext.com>
        Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
        Cc: Kees Cook <keescook@chromium.org>
        Reviewed-by: Kees Cook <keescook@chromium.org>
        Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
(cherry picked from commit 5b06eea)
        Signed-off-by: Marcin Wcisło <marcin.wcislo@conclusive.pl>

Author: mhiramat

tools/testing/selftests/breakpoints/breakpoint_test_arm64.c

@@ -118,7 +118,7 @@ static bool set_watchpoint(pid_t pid, int size, int wp)
 	return false;
 }
 
-static bool arun_test(int wr_size, int wp_size, int wr, int wp)
+static bool run_test(int wr_size, int wp_size, int wr, int wp)
 {
 	int status;
 	siginfo_t siginfo;