checkpatch: add test for char * arrays that could be static const

static const char* arrays create smaller text as each function call does
not have to populate the array.

Emit a warning when char *arrays aren't static const and the array is
not apparently global by being declared in the first column.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -2675,6 +2675,13 @@ sub process {
 				$herecurr);
                }
 
+# check for non-global char *foo[] = {"bar", ...} declarations.
+		if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
+			WARN("STATIC_CONST_CHAR_ARRAY",
+			     "char * array declaration might be better as static const\n" .
+				$herecurr);
+               }
+
 # check for function declarations without arguments like "int foo()"
 		if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
 			if (ERROR("FUNCTION_WITHOUT_ARGS",