checkpatch: fix networking kernel-doc block comment defect

checkpatch can generate a false positive when inserting a new kernel-doc
block and function above an existing kernel-doc block.

Fix it by checking that the context line is also a newly inserted line.

Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/checkpatch.pl

@@ -2086,6 +2086,7 @@ sub process {
 		if ($realfile =~ m@^(drivers/net/|net/)@ &&
 		    $prevrawline =~ /^\+[ \t]*\/\*/ &&		#starting /*
 		    $prevrawline !~ /\*\/[ \t]*$/ &&		#no trailing */
+		    $rawline =~ /^\+/ &&			#line is new
 		    $rawline !~ /^\+[ \t]*\*/) {		#no leading *
 			WARN("NETWORKING_BLOCK_COMMENT_STYLE",
 			     "networking block comments start with * on subsequent lines\n" . $hereprev);