hw/tc58128.c: Remove unnecessary check for g_malloc failure

Remove a check for g_malloc failing: this never happens.
Also use g_malloc rather than g_malloc0 as we immediately
memset the entire region and so zero-initialising it is pointless.
Spotted by Coverity (see bug 887883).
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/tc58128.c

@@ -30,12 +30,8 @@ static void init_dev(tc58128_dev * dev, const char *filename)
     int ret, blocks;
 
     dev->state = WAIT;
-    dev->flash_contents = g_malloc0(FLASH_SIZE);
+    dev->flash_contents = g_malloc(FLASH_SIZE);
     memset(dev->flash_contents, 0xff, FLASH_SIZE);
-    if (!dev->flash_contents) {
-	fprintf(stderr, "could not alloc memory for flash\n");
-	exit(1);
-    }
     if (filename) {
 	/* Load flash image skipping the first block */
 	ret = load_image(filename, dev->flash_contents + 528 * 32);