Use safer allocation macros

Use of these macros, apart from the benefits mentioned in the commit
that adds the macros, has some other good side effects:

-  Consistency in getting the size of the object from sizeof(type),
   instead of a mix of sizeof(type) sometimes and sizeof(*p) other
   times.

-  More readable code: no casts, and no sizeof(), so also shorter lines
   that we don't need to cut.

-  Consistency in using array allocation calls for allocations of arrays
   of objects, even when the object size is 1.

Cc: Valentin V. Bartenev <vbartenev@gmail.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>

libmisc/obscure.c

@@ -21,6 +21,8 @@
  */
 #include <ctype.h>
 #include <stdio.h>
+
+#include "alloc.h"
 #include "prototypes.h"
 #include "defines.h"
 #include "getdef.h"
@@ -158,7 +160,7 @@ static /*@observer@*//*@null@*/const char *password_check (
 
 	newmono = str_lower (xstrdup (new));
 	oldmono = str_lower (xstrdup (old));
-	wrapped = xmalloc (strlen (oldmono) * 2 + 1);
+	wrapped = XMALLOCARRAY (strlen (oldmono) * 2 + 1, char);
 	strcpy (wrapped, oldmono);
 	strcat (wrapped, oldmono);