char: Replace HTTP links with HTTPS ones

Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Link: https://lore.kernel.org/r/20200713104453.33414-1-grandmaster@al2klimov.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/echo/echo.c b/drivers/misc/echo/echo.c
index 713e92e..3c4eaba 100644
--- a/drivers/misc/echo/echo.c
+++ b/drivers/misc/echo/echo.c
@@ -66,13 +66,13 @@
        Path Models", IEEE Transactions on communications, COM-25,
        No. 6, June
        1977.
-       http://www.rowetel.com/images/echo/dual_path_paper.pdf
+       https://www.rowetel.com/images/echo/dual_path_paper.pdf
 
    [2] The classic, very useful paper that tells you how to
        actually build a real world echo canceller:
 	 Messerschmitt, Hedberg, Cole, Haoui, Winship, "Digital Voice
 	 Echo Canceller with a TMS320020,
-	 http://www.rowetel.com/images/echo/spra129.pdf
+	 https://www.rowetel.com/images/echo/spra129.pdf
 
    [3] I have written a series of blog posts on this work, here is
        Part 1: http://www.rowetel.com/blog/?p=18
@@ -80,7 +80,7 @@
    [4] The source code http://svn.rowetel.com/software/oslec/
 
    [5] A nice reference on LMS filters:
-	 http://en.wikipedia.org/wiki/Least_mean_squares_filter
+	 https://en.wikipedia.org/wiki/Least_mean_squares_filter
 
    Credits: