[PATCH] UBI-Utils: ubimirror discards returncode

[Alexander Schmidt <alexs@linux.vnet.ibm.com>]

Ubimirror compares volumes before they are mirrored, but discards the
result of the comparison and alway copies volumes.

I've tested this code with equal and unequal volumes and it seems to work
fine now.

Signed-off-by: Alexander Schmidt <alexs@linux.vnet.ibm.com>
---
 ubi-utils/src/libubimirror.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)

--- mtd-utils.orig/ubi-utils/src/libubimirror.c
+++ mtd-utils/ubi-utils/src/libubimirror.c
@@ -190,11 +190,13 @@ int ubimirror(uint32_t devno, int seqnum
 		if (rc < 0) {
 			EBUF("compare error volume %d and %d", src_id, ids[i]);
 			goto err;
-		}
-		rc = copy_files(fd_in, fd_out);
-		if (rc != 0) {
-			EBUF("mirror error volume %d to %d", src_id, ids[i]);
-			goto err;
+		} else if (rc == compare_different) {
+			rc = copy_files(fd_in, fd_out);
+			if (rc != 0) {
+				EBUF("mirror error volume %d to %d", src_id,
+						ids[i]);
+				goto err;
+			}
 		}
 		if ((rc = ubi_vol_close(fd_out)) == -1) {
 			EBUF("close error volume %d", ids[i]);