checksrc: detect and warn for lack of spaces next to plus signs

                      "no space before equals sign");

                      "no space before equals sign");

        }

        }

        # check for plus signs without spaces next to it

        if($nostr =~ /(.*)[^+]\+[a-z0-9]/i) {

            checkwarn("PLUSNOSPACE",

                      $line, length($1)+1, $file, $ol,

                      "no space after plus sign");

        }

        # check for plus sign without spaces before it

        elsif($nostr =~ /(.*)[a-z0-9]\+[^+]/i) {

            checkwarn("NOSPACEPLUS",

                      $line, length($1)+1, $file, $ol,

                      "no space before plus sign");

        }

        $line++;

        $line++;

        $prevl = $ol;

        $prevl = $ol;

    }

    }