rely on the maildir's existence with "SyncState *"

now that we open the box first, we know that it will exist at this
point.

src/sync.c

@@ -621,7 +621,6 @@ box_selected( int sts, void *aux )
 			free( cmname );
 		}
 		free( csname );
-	}
 		if (!(s = strrchr( svars->dname, '/' ))) {
 			error( "Error: invalid SyncState '%s'\n", svars->dname );
 			goto sbail;
@@ -632,6 +631,7 @@ box_selected( int sts, void *aux )
 			goto sbail;
 		}
 		*s = '/';
+	}
 	nfasprintf( &svars->jname, "%s.journal", svars->dname );
 	nfasprintf( &svars->nname, "%s.new", svars->dname );
 	nfasprintf( &svars->lname, "%s.lock", svars->dname );