selftests/nolibc: fix testcase status alignment

Center-align all possible status reports.
Before OK and FAIL were center-aligned in relation to each other but
SKIPPED and FAILED would be left-aligned.

Before:

7 environ_addr = <0x7fffef3e7c50>                                [OK]
8 environ_envp = <0x7fffef3e7c58>                               [FAIL]
9 environ_auxv                                                  [SKIPPED]
10 environ_total                                                [SKIPPED]
11 environ_HOME = <0x7fffef3e99bd>                               [OK]
12 auxv_addr                                                    [SKIPPED]
13 auxv_AT_UID = 1000                                            [OK]

After:

7 environ_addr = <0x7ffff13b00a0>                                 [OK]
8 environ_envp = <0x7ffff13b00a8>                                [FAIL]
9 environ_auxv                                                  [SKIPPED]
10 environ_total                                                [SKIPPED]
11 environ_HOME = <0x7ffff13b19bd>                                [OK]
12 auxv_addr                                                    [SKIPPED]
13 auxv_AT_UID = 1000                                             [OK]
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>

tools/testing/selftests/nolibc/nolibc-test.c

@@ -150,11 +150,11 @@ static void result(int llen, enum RESULT r)
 	const char *msg;
 
 	if (r == OK)
-		msg = " [OK]";
+		msg = "  [OK]";
 	else if (r == SKIPPED)
 		msg = "[SKIPPED]";
 	else
-		msg = "[FAIL]";
+		msg = " [FAIL]";
 
 	if (llen < 64)
 		putcharn(' ', 64 - llen);