Free mdstat data structures properly.

In one case we called 'free' instead of 'mdstat_free'.
In others we didn't free at all.

Signed-off-by: NeilBrown <neilb@suse.de>

Monitor.c

@@ -619,7 +619,7 @@ int Wait(char *dev)
 			free_mdstat(ms);
 			return rv;
 		}
-		free(ms);
+		free_mdstat(ms);
 		rv = 0;
 		mdstat_wait(5);
 	}

mapfile.c

@@ -245,6 +245,7 @@ void RebuildMap(void)
 			break;
 		}
 	}
+	free_mdstat(mdstat);
 	map_write(map);
 	map_free(map);
 }

mdadm.c

@@ -1217,6 +1217,7 @@ int main(int argc, char *argv[])
 							     export, test, homehost);
 						put_md_name(name);
 					}
+					free_mdstat(ms);
 				} else	if (devmode == 'S' && scan) {
 					/* apply --stop to all devices in /proc/mdstat */
 					/* Due to possible stacking of devices, repeat until
@@ -1249,6 +1250,7 @@ int main(int argc, char *argv[])
 
 							put_md_name(name);
 						}
+						free_mdstat(ms);
 					} while (!last && err);
 					if (err) rv |= 1;
 				} else {