gpt: command: Remove duplicated check for empty partition description

Exactly the same check is performed in set_gpt_info() function executed
just after this check.

Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/cmd_gpt.c b/common/cmd_gpt.c
index e3c0297..6bea2c7 100644
--- a/common/cmd_gpt.c
+++ b/common/cmd_gpt.c
@@ -293,9 +293,6 @@
 	u8 part_count = 0;
 	disk_partition_t *partitions = NULL;
 
-	if (!str_part)
-		return -1;
-
 	/* fill partitions */
 	ret = set_gpt_info(blk_dev_desc, str_part,
 			&str_disk_guid, &partitions, &part_count);