upsync: no time to print on first execution

Oops.

Change-Id: I99871bc45c3f1961eeebe5ef46904472357e738e
Reviewed-on: https://upspin-review.googlesource.com/c/exp/+/19360
Reviewed-by: David Presotto <presotto@gmail.com>
diff --git a/cmd/upsync/upsync.go b/cmd/upsync/upsync.go
index 16124a8..d7e799d 100644
--- a/cmd/upsync/upsync.go
+++ b/cmd/upsync/upsync.go
@@ -125,7 +125,9 @@
 	} else { // normal case
 		lastUpsync = lastUpsyncFi.ModTime().Unix()
 	}
-	log.Printf("lastUpsync %v", lastUpsyncFi.ModTime())
+	if lastUpsyncFi != nil {
+		log.Printf("lastUpsync %v", lastUpsyncFi.ModTime())
+	}
 
 	// Find first component of current directory that looks like email address,
 	// then make wd == upspin working directory.