efisecdb: fix stray extra include

I don't know why efisecdb.c has a linux.h include, but it doesn't need
it or use it for anything.  I think someone's editor got a little too
empowered and dropped it there, because it's not where I'd choose to put
that include if it /were/ justified, either.

This takes it out.

Signed-off-by: Peter Jones <pjones@redhat.com>

Author: vathpela

src/efisecdb.c

@@ -6,7 +6,6 @@
  */
 #include "fix_coverity.h" // IWYU pragma: keep
 
-#include "linux.h"
 #include <err.h>
 #include <errno.h>
 #include <fcntl.h>