cmd: efidebug: Add missing \n at the end of message

Currently message is not intended that prompt end up at the end of debug
line. For example like this:

DFU alt info setting: done
DFU entities configuration failed!
(partition table does not match dfu_alt_info?)
Firmware update failed: <NULL>
Cannot handle a capsule at 10000000Zynq>

Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index df928ce..84e6ff5 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -77,7 +77,7 @@
 
 	ret = EFI_CALL(RT->update_capsule(&capsule, 1, 0));
 	if (ret) {
-		printf("Cannot handle a capsule at %p", capsule);
+		printf("Cannot handle a capsule at %p\n", capsule);
 		return CMD_RET_FAILURE;
 	}