[PATCH] cmp: Only return success when both files have the same contents

[Glenn Washburn]

From: Li Gen <ligenlive@gmail.com>

This allows the cmp command to be used in GRUB scripts to conditionally
run commands based on whether two files are the same.

Signed-off-by: Li Gen <ligenlive@gmail.com>
Signed-off-by: Glenn Washburn <development@efficientek.com>
---
 grub-core/commands/cmp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/grub-core/commands/cmp.c b/grub-core/commands/cmp.c
index e9c3b25d34..e1665cf27b 100644
--- a/grub-core/commands/cmp.c
+++ b/grub-core/commands/cmp.c
@@ -38,6 +38,7 @@ grub_cmd_cmp (grub_command_t cmd __attribute__ ((unused)),
   grub_file_t file2 = 0;
   char *buf1 = 0;
   char *buf2 = 0;
+  grub_err_t err = GRUB_ERR_TEST_FAILURE;
 
   if (argc != 2)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
@@ -91,6 +92,7 @@ grub_cmd_cmp (grub_command_t cmd __attribute__ ((unused)),
 
       /* TRANSLATORS: it's always exactly 2 files.  */
       grub_printf_ (N_("The files are identical.\n"));
+      err = GRUB_ERR_NONE;
     }
 
 cleanup:
@@ -102,7 +104,7 @@ cleanup:
   if (file2)
     grub_file_close (file2);
 
-  return grub_errno;
+  return err;
 }
 
 static grub_command_t cmd;
-- 
2.34.1