gnu: emacs-grep-a-lot: Use GIT-FILE-NAME.

* gnu/packages/emacs-xyz (emacs-grep-a-lot)[source]: Use GIT-FILE-NAME.

gnu/packages/emacs-xyz.scm

@@ -2248,15 +2248,15 @@ column by drawing a thin line down the length of the editing window.")
   (package
     (name "emacs-grep-a-lot")
     (version "1.0.7")
-    (source (origin
-              (method git-fetch)
-              (uri (git-reference
-                    (url "https://github.com/ZungBang/emacs-grep-a-lot.git")
-                    (commit "9f9f645b9e308a0d887b66864ff97d0fca1ba4ad")))
-              (file-name (string-append name "-" version "-checkout"))
-              (sha256
-               (base32
-                "1f8262mrlinzgnn4m49hbj1hm3c1mvzza24py4b37sasn49546lw"))))
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/ZungBang/emacs-grep-a-lot.git")
+             (commit "9f9f645b9e308a0d887b66864ff97d0fca1ba4ad")))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "1f8262mrlinzgnn4m49hbj1hm3c1mvzza24py4b37sasn49546lw"))))
     (build-system emacs-build-system)
     (home-page "https://github.com/ZungBang/emacs-grep-a-lot")
     (synopsis "Enables multiple grep buffers in Emacs")