checkpatch: add optional static const to blank line declarations test

Using a static const struct definition as part of a series of
declarations produces a false positive "Missing a blank line after
declarations" for code like:

  WARNING: Missing a blank line after declarations
  #710: FILE: drivers/gpu/drm/tidss/tidss_scale_coefs.c:137:
  +       int inc;
  +       static const struct {

So fix it.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Joe Perches <[email protected]>
Reported-by: Jyri Sarha <[email protected]>
Cc: "Valkeinen, Tomi" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: JoePerches

scripts/checkpatch.pl

@@ -3311,7 +3311,7 @@ sub process {
 			# known declaration macros
 		      $sline =~ /^\+\s+$declaration_macros/ ||
 			# start of struct or union or enum
-		      $sline =~ /^\+\s+(?:union|struct|enum|typedef)\b/ ||
+		      $sline =~ /^\+\s+(?:static\s+)?(?:const\s+)?(?:union|struct|enum|typedef)\b/ ||
 			# start or end of block or continuation of declaration
 		      $sline =~ /^\+\s+(?:$|[\{\}\.\#\"\?\:\(\[])/ ||
 			# bitfield continuation