Btrfs-progs: let the error message outputed only once

If we fail to execute the command:
		btrfs qgroup show <mnt>
It will output the follow messages:
	ERROR: can't perform the search - Inappropriate ioctl for device
	ERROR: can't list qgroups

The error is outputed twice, this is wrong, fix it.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>

diff --git a/cmds-qgroup.c b/cmds-qgroup.c
index 26f0ab0..79888c8 100644 (file)
--- a/cmds-qgroup.c
+++ b/cmds-qgroup.c
@@ -120,7 +120,6 @@ int list_qgroups(int fd)
        struct btrfs_ioctl_search_header *sh;
        unsigned long off = 0;
        unsigned int i;
-       int e;
        struct btrfs_qgroup_info_item *info;
 
        memset(&args, 0, sizeof(args));
@@ -143,13 +142,9 @@ int list_qgroups(int fd)
 
        while (1) {
                ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
-               e = errno;
-               if (ret < 0) {
-                       fprintf(stderr,
-                               "ERROR: can't perform the search - %s\n",
-                               strerror(e));
+               if (ret < 0)
                        return ret;
-               }
+
                /* the ioctl returns the number of item it found in nr_items */
                if (sk->nr_items == 0)
                        break;