checkpatch: allow --fix removal of unnecessary break statements

switch/case use of break after a return, goto or break is unnecessary.

There is an existing warning for the return and goto uses, so add
break and a --fix option too.

Link: https://lkml.kernel.org/r/d9ea654104d55f590fb97d252d64a66b23c1a096.camel@perches.comSigned-off-by: Joe Perches <joe@perches.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Tom Rix <trix@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -3699,12 +3699,16 @@ sub process {
 		}
 
 # check indentation of a line with a break;
-# if the previous line is a goto or return and is indented the same # of tabs
+# if the previous line is a goto, return or break
+# and is indented the same # of tabs
 		if ($sline =~ /^\+([\t]+)break\s*;\s*$/) {
 			my $tabs = $1;
-			if ($prevline =~ /^\+$tabs(?:goto|return)\b/) {
-				WARN("UNNECESSARY_BREAK",
-				     "break is not useful after a goto or return\n" . $hereprev);
+			if ($prevline =~ /^\+$tabs(goto|return|break)\b/) {
+				if (WARN("UNNECESSARY_BREAK",
+					 "break is not useful after a $1\n" . $hereprev) &&
+				    $fix) {
+					fix_delete_line($fixlinenr, $rawline);
+				}
 			}
 		}