(image-jpeg-p): Fix call of substring.

diff --git a/lisp/image.el b/lisp/image.el
index f08db3879b11971795bbabffb88ecbb2a12786bc..f7ab77379dc6b0e9a29ddf1dbd1c7d40e36662b5 100644 (file)
--- a/lisp/image.el
+++ b/lisp/image.el
@@ -64,7 +64,7 @@ a non-nil value, TYPE is the image's type ")
            (when (and (>= code #xe0) (<= code #xef))
              ;; APP0 LEN1 LEN2 "JFIF\0"
              (throw 'jfif 
-                    (string-match "JFIF" (substring data i nbytes))))
+                    (string-match "JFIF" (substring data i (+ i nbytes)))))
            (setq i (+ i 1 nbytes))))))))