mtdparts: Fix uninitialized scalar usage

When reworking this code to fix other issues found by Coverity, I forgot
to ensure tmp_ep was always cleared before use.

Reported-by: Coverity (CID: 166612)
Fixes: bc028345acc4 ("mtdparts: Fix final outstanding issue reported by Coverity")
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/mtdparts.c b/cmd/mtdparts.c
index 6e12275..3275eb9 100644
--- a/cmd/mtdparts.c
+++ b/cmd/mtdparts.c
@@ -1751,6 +1751,7 @@
 	/* save it for later parsing, cannot rely on current partition pointer
 	 * as 'partition' variable may be updated during init */
 	memset(tmp_parts, 0, sizeof(tmp_parts));
+	memset(tmp_ep, 0, sizeof(tmp_ep));
 	if (current_partition)
 		strncpy(tmp_ep, current_partition, PARTITION_MAXLEN);