Don't trigger and error on -As if all arrays are already started.

From: Luca Berra <bluca@comedia.it>

Put another way, if we find any active arrays, then assume things are
going as planned.

ChangeLog

@@ -11,6 +11,8 @@ Changes Prior to this release
     -   Remove error in md_open if array is already active.  This isn't
 	needed and gets in the ways if an array was created e.g. in
 	initramfs, but device doesn't yet exist in /dev.
+    -   When --assemble --scan is run, if all arrays that could be found
+	have already been started, don't report an error.
 
 Changes Prior to 2.5.4 release
     -   When creating devices in /dev/md/ create matching symlinks

mdadm.c

@@ -1033,7 +1033,7 @@ int main(int argc, char *argv[])
 				}
 				if (ioctl(mdfd, GET_ARRAY_INFO, &array)>=0)
 					/* already assembled, skip */
-					;
+					cnt++;
 				else {
 					rv |= Assemble(ss, array_list->devname, mdfd,
 						       array_list,