btrfs-progs: defrag: cleanup temporary errno value

Rename a single letter variable and move the defintion to the scope of
use.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/cmds-filesystem.c b/cmds-filesystem.c
index 64b1cc4..eb16875 100644 (file)
--- a/cmds-filesystem.c
+++ b/cmds-filesystem.c
@@ -1036,7 +1036,6 @@ static int cmd_filesystem_defrag(int argc, char **argv)
        int i;
        int recursive = 0;
        int ret = 0;
-       int e = 0;
        int compress_type = BTRFS_COMPRESS_NONE;
        DIR *dirstream;
 
@@ -1112,6 +1111,7 @@ static int cmd_filesystem_defrag(int argc, char **argv)
 
        for (i = optind; i < argc; i++) {
                struct stat st;
+               int defrag_err = 0;
 
                dirstream = NULL;
                fd = open_file_or_dir(argv[i], &dirstream);
@@ -1148,10 +1148,10 @@ static int cmd_filesystem_defrag(int argc, char **argv)
                                printf("%s\n", argv[i]);
                        ret = do_defrag(fd, defrag_global_fancy_ioctl,
                                        &defrag_global_range);
-                       e = errno;
+                       defrag_err = errno;
                }
                close_file_or_dir(fd, dirstream);
-               if (ret && e == ENOTTY && defrag_global_fancy_ioctl) {
+               if (ret && defrag_err == ENOTTY && defrag_global_fancy_ioctl) {
                        error("defrag range ioctl not "
                                "supported in this kernel, please try "
                                "without any options.");
@@ -1159,7 +1159,8 @@ static int cmd_filesystem_defrag(int argc, char **argv)
                        break;
                }
                if (ret) {
-                       error("defrag failed on %s: %s", argv[i], strerror(e));
+                       error("defrag failed on %s: %s", argv[i],
+                                       strerror(defrag_err));
                        defrag_global_errors++;
                }
        }