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>

lib/sssd.c

@@ -6,6 +6,8 @@
 #include <stdio.h>
 #include <sys/wait.h>
 #include <sys/types.h>
+
+#include "alloc.h"
 #include "exitcodes.h"
 #include "defines.h"
 #include "prototypes.h"
@@ -24,7 +26,7 @@ int sssd_flush_cache (int dbflags)
 	const char *spawnedEnv[] = {NULL};
 	int i = 0;
 
-	sss_cache_args = malloc(4);
+	sss_cache_args = MALLOCARRAY(4, char);
 	if (sss_cache_args == NULL) {
 	    return -1;
 	}