image-dired: Use string-match-p in one case

* lisp/image-dired.el (image-dired-get-thumbnail-image): Use
string-match-p.

diff --git a/lisp/image-dired.el b/lisp/image-dired.el
index 0e597a515e730ea8aead091ffae92986436560fb..0723804ff27bf853040d60c429e5917159f5cd00 100644 (file)
--- a/lisp/image-dired.el
+++ b/lisp/image-dired.el
@@ -540,7 +540,7 @@ Create the thumbnail directory if it does not exist."
 
 (defun image-dired-get-thumbnail-image (file)
   "Return the image descriptor for a thumbnail of image file FILE."
-  (unless (string-match (image-file-name-regexp) file)
+  (unless (string-match-p (image-file-name-regexp) file)
     (error "%s is not a valid image file" file))
   (let* ((thumb-file (image-dired-thumb-name file))
         (thumb-attr (file-attributes thumb-file)))