checkpatch: fix left brace warning

using checkpatch with Perl 5.22.0 generates a warning,
this is fixed in linux through commit:

commit 4e5d56bdf892e18832a6540b63ebf709966bce2a
Author: Eddie Kovsky <ewk@edkovsky.org>
Date:   Wed Sep 9 15:37:52 2015 -0700

checkpatch: fix left brace warning

Using checkpatch.pl with Perl 5.22.0 generates the following warning:

Unescaped left brace in regex is deprecated, passed through in regex;

This patch fixes the warnings by escaping occurrences of the left brace
inside the regular expression.

Adapt it for U-Boot.

Signed-off-by: Heiko Schocher <hs@denx.de>

scripts/checkpatch.pl

@@ -2825,8 +2825,8 @@ sub process {
 
 # function brace can't be on same line, except for #defines of do while,
 # or if closed on same line
-		if (($line=~/$Type\s*$Ident\(.*\).*\s{/) and
-		    !($line=~/\#\s*define.*do\s{/) and !($line=~/}/)) {
+		if (($line=~/$Type\s*$Ident\(.*\).*\s\{/) and
+		    !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
 			ERROR("OPEN_BRACE",
 			      "open brace '{' following function declarations go on the next line\n" . $herecurr);
 		}
@@ -3259,8 +3259,8 @@ sub process {
 ## 		}
 
 #need space before brace following if, while, etc
-		if (($line =~ /\(.*\){/ && $line !~ /\($Type\){/) ||
-		    $line =~ /do{/) {
+		if (($line =~ /\(.*\)\{/ && $line !~ /\($Type\){/) ||
+		    $line =~ /do\{/) {
 			if (ERROR("SPACING",
 				  "space required before the open brace '{'\n" . $herecurr) &&
 			    $fix) {
@@ -3633,7 +3633,7 @@ sub process {
 			    $dstat !~ /^for\s*$Constant$/ &&				# for (...)
 			    $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&	# for (...) bar()
 			    $dstat !~ /^do\s*{/ &&					# do {...
-			    $dstat !~ /^\({/ &&						# ({...
+			    $dstat !~ /^\(\{/ &&						# ({...
 			    $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
 			{
 				$ctx =~ s/\n*$//;