linux-boot: Don't catch exceptions thrown by 'mount-root-file-system'.

* gnu/build/linux-boot.scm (mount-root-file-system): Remove 'catch #t'
  around body.  This was unneeded and even inconvenient because this
  procedure is called from within 'call-with-error-handling' already.

gnu/build/linux-boot.scm

@@ -255,8 +255,6 @@ UNIONFS."
       (newline port)
       (close-port port)))
 
-  (catch #t
-    (lambda ()
   (if volatile-root?
       (begin
         (mkdir-p "/real-root")
@@ -283,11 +281,7 @@ UNIONFS."
         (mark-as-not-killable (pidof unionfs)))
       (begin
         (check-file-system root type)
-            (mount root "/root" type))))
-    (lambda args
-      (format (current-error-port) "exception while mounting '~a': ~s~%"
-              root args)
-      (start-repl)))
+        (mount root "/root" type)))
 
   (copy-file "/proc/mounts" "/root/etc/mtab"))