clients: Use xmalloc in a few more places

Just changes some places where a malloc failure is unhandled
to our xmalloc function that exit()s a little more gracefully.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Bryce Harrington <b.harrington@samsung.com>

clients/editor.c

@@ -682,7 +682,7 @@ text_entry_update_layout(struct text_entry *entry)
 	       (entry->preedit.text ? strlen(entry->preedit.text) : 0)));
 
 	if (entry->preedit.text) {
-		text = malloc(strlen(entry->text) + strlen(entry->preedit.text) + 1);
+		text = xmalloc(strlen(entry->text) + strlen(entry->preedit.text) + 1);
 		strncpy(text, entry->text, entry->cursor);
 		strcpy(text + entry->cursor, entry->preedit.text);
 		strcpy(text + entry->cursor + strlen(entry->preedit.text),
@@ -764,7 +764,7 @@ static void
 text_entry_insert_at_cursor(struct text_entry *entry, const char *text,
 			    int32_t cursor, int32_t anchor)
 {
-	char *new_text = malloc(strlen(entry->text) + strlen(text) + 1);
+	char *new_text = xmalloc(strlen(entry->text) + strlen(text) + 1);
 
 	strncpy(new_text, entry->text, entry->cursor);
 	strcpy(new_text + entry->cursor, text);

clients/window.c

@@ -5391,7 +5391,7 @@ init_dummy_surface(struct display *display)
 	void *data;
 
 	len = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, 1);
-	data = malloc(len);
+	data = xmalloc(len);
 	display->dummy_surface =
 		cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32,
 						    1, 1, len);