windows: Rename write_from_window* to window_flush*

Change-Id: I17b3457c1689114e76652632358faca3a5130d9d
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/mboxd_msg.c b/mboxd_msg.c
index 5eae6d6..1fd29f7 100644
--- a/mboxd_msg.c
+++ b/mboxd_msg.c
@@ -587,7 +587,7 @@
 				offset = i;
 				count++;
 			} else { /* Change in streak type */
-				rc = write_from_window(context, offset, count,
+				rc = window_flush(context, offset, count,
 						       prev);
 				if (rc < 0) {
 					return rc;
@@ -597,7 +597,7 @@
 			}
 		} else {
 			if (prev != WINDOW_CLEAN) { /* End of a streak */
-				rc = write_from_window(context, offset, count,
+				rc = window_flush(context, offset, count,
 						       prev);
 				if (rc < 0) {
 					return rc;
@@ -610,7 +610,7 @@
 	}
 
 	if (prev != WINDOW_CLEAN) { /* Still the last streak to write */
-		rc = write_from_window(context, offset, count, prev);
+		rc = window_flush(context, offset, count, prev);
 		if (rc < 0) {
 			return rc;
 		}