checkpatch: Add --strict messages for blank lines around braces

Blank lines around braces are not unnecessary.  Emit a message on the use
of these blank lines only when using --strict.

int foo(int bar)
{

	something or other....

}

is generally written in the kernel as:

int foo(int bar)
{
	something or other...
}
Signed-off-by: NJoe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -3189,6 +3189,16 @@ sub process {
 			}
 		}
 
+# check for unnecessary blank lines around braces
+		if (($line =~ /^..*}\s*$/ && $prevline =~ /^.\s*$/)) {
+			CHK("BRACES",
+			    "Blank lines aren't necessary before a close brace '}'\n" . $hereprev);
+		}
+		if (($line =~ /^.\s*$/ && $prevline =~ /^..*{\s*$/)) {
+			CHK("BRACES",
+			    "Blank lines aren't necessary after an open brace '{'\n" . $hereprev);
+		}
+
 # no volatiles please
 		my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
 		if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {