checkpatch: add NOKPROBE_SYMBOL to the whitelist of lines that can occur immediately after functions

It's customary for NOKPROBE_SYMBOL() macro usage to appear immediately
after a function's final closing brace, but checkpatch doesn't know that
yet.  As a result, checkpatch --strict incorrectly flags this common
kernel pattern, e.g.,

CHECK: Please use a blank line after function/struct/union/enum declarations
33: FILE: arch/riscv/kernel/traps.c:273:
 }
+NOKPROBE_SYMBOL(probe_single_step_handler);

Fix by adding NOKPROBE_SYMBOL to the whitelist of patterns that are
cleared to appear immediately after functions.

Link: https://lore.kernel.org/130be7db-6098-86a4-60fe-0c1a5d9e30ba@kernel.org
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Acked-by: Joe Perches <joe@perches.com>
Cc: Nam Cao <namcao@linutronix.de>
Cc: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

scripts/checkpatch.pl

@@ -4154,6 +4154,7 @@ sub process {
 		      $line =~ /^\+[a-z_]*init/ ||
 		      $line =~ /^\+\s*(?:static\s+)?[A-Z_]*ATTR/ ||
 		      $line =~ /^\+\s*DECLARE/ ||
+		      $line =~ /^\+\s*NOKPROBE_SYMBOL/ ||
 		      $line =~ /^\+\s*builtin_[\w_]*driver/ ||
 		      $line =~ /^\+\s*__setup/)) {
 			if (CHK("LINE_SPACING",