clients & tests: Unify multiple definitions of x*alloc and related functions

Direct fail_on_null calls now produce output like:

    [weston-info] clients/weston-info.c:714: out of memory

xmalloc, et al produce output on failure like:

    [weston-info] out of memory (-1)

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

tests/ivi_layout-test.c

@@ -29,6 +29,7 @@
 #include <string.h>
 
 #include "shared/helpers.h"
+#include "shared/xalloc.h"
 #include "weston-test-client-helper.h"
 #include "ivi-application-client-protocol.h"
 #include "ivi-test.h"

tests/presentation-test.c

@@ -32,6 +32,7 @@
 #include <time.h>
 
 #include "shared/helpers.h"
+#include "shared/xalloc.h"
 #include "weston-test-client-helper.h"
 #include "presentation-time-client-protocol.h"
 

tests/weston-test-client-helper.c

@@ -33,25 +33,15 @@
 #include <sys/mman.h>
 #include <cairo.h>
 
-#include "zalloc.h"
 #include "shared/os-compatibility.h"
+#include "shared/xalloc.h"
+#include "shared/zalloc.h"
 #include "weston-test-client-helper.h"
 
 #define max(a, b) (((a) > (b)) ? (a) : (b))
 #define min(a, b) (((a) > (b)) ? (b) : (a))
 #define clip(x, a, b)  min(max(x, a), b)
 
-void *
-fail_on_null(void *p)
-{
-	if (p == NULL) {
-		fprintf(stderr, "out of memory\n");
-		exit(EXIT_FAILURE);
-	}
-	return p;
-}
-
-
 int
 surface_contains(struct surface *surface, int x, int y)
 {

tests/weston-test-client-helper.h

@@ -145,21 +145,6 @@ struct rectangle {
 	int height;
 };
 
-void *
-fail_on_null(void *p);
-
-static inline void *
-xzalloc(size_t s)
-{
-	return fail_on_null(calloc(1, s));
-}
-
-static inline void *
-xmalloc(size_t s)
-{
-	return fail_on_null(malloc(s));
-}
-
 struct client *
 create_client(void);