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.
Signed-off-by: NEddie Kovsky <ewk@edkovsky.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -3571,7 +3571,7 @@ 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=~/}/)) {
+		    !($line=~/\#\s*define.*do\s\{/) and !($line=~/}/)) {
 			if (ERROR("OPEN_BRACE",
 				  "open brace '{' following function declarations go on the next line\n" . $herecurr) &&
 			    $fix) {
@@ -4083,8 +4083,8 @@ 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) {
@@ -4531,7 +4531,7 @@ 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/)
 			{
 				$ctx =~ s/\n*$//;