Remove superfluous casts

-  Every non-const pointer converts automatically to void *.
-  Every pointer converts automatically to void *.
-  void * converts to any other pointer.
-  const void * converts to any other const pointer.
-  Integer variables convert to each other.

I changed the declaration of a few variables in order to allow removing
a cast.

However, I didn't attempt to edit casts inside comparisons, since they
are very delicate.  I also kept casts in variadic functions, since they
are necessary, and in allocation functions, because I have other plans
for them.

I also changed a few casts to int that are better as ptrdiff_t.

This change has triggered some warnings about const correctness issues,
which have also been fixed in this patch (see for example src/login.c).

Signed-off-by: Alejandro Colomar <alx@kernel.org>

libmisc/obscure.c

@@ -257,7 +257,7 @@ static /*@observer@*//*@null@*/const char *obscure_msg (
 		}
 
 	}
-	maxlen = (size_t) getdef_num ("PASS_MAX_LEN", 8);
+	maxlen = getdef_num ("PASS_MAX_LEN", 8);
 	if (   (oldlen <= maxlen)
 	    && (newlen <= maxlen)) {
 		return NULL;