board: st: common: fix the error messages in stboard command

Add missing \n at the end of the error trace

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/board/st/common/cmd_stboard.c b/board/st/common/cmd_stboard.c
index c1ecd64..e12669b 100644
--- a/board/st/common/cmd_stboard.c
+++ b/board/st/common/cmd_stboard.c
@@ -92,14 +92,14 @@
 			&otp, sizeof(otp));
 
 	if (ret != sizeof(otp)) {
-		puts("OTP read error");
+		puts("OTP read error\n");
 		return CMD_RET_FAILURE;
 	}
 
 	ret = misc_read(dev, STM32_BSEC_LOCK(BSEC_OTP_BOARD),
 			&lock, sizeof(lock));
 	if (ret != sizeof(lock)) {
-		puts("LOCK read error");
+		puts("LOCK read error\n");
 		return CMD_RET_FAILURE;
 	}