vi: remove superfluous check on filename == ""

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/editors/vi.c b/editors/vi.c
index 2861250..f925984 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2306,7 +2306,7 @@
 	int cnt;
 
 	cnt = -1;
-	if (fn && fn[0] && stat(fn, &st_buf) == 0)	// see if file exists
+	if (fn && stat(fn, &st_buf) == 0)	// see if file exists
 		cnt = (int) st_buf.st_size;
 	return cnt;
 }