cmd_mem: Remove unused variable

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/common/cmd_mem.c b/common/cmd_mem.c
index d7666c2..400cfd7 100644
--- a/common/cmd_mem.c
+++ b/common/cmd_mem.c
@@ -1175,7 +1175,6 @@
 {
 	unsigned long src, dst;
 	unsigned long src_len = ~0UL, dst_len = ~0UL;
-	int err;
 
 	switch (argc) {
 		case 4: