cmd: ubi: remove redundant initializations

Signed-off-by: Martin Kurbanov <mmkurbanov@salutedevices.com>
diff --git a/cmd/ubi.c b/cmd/ubi.c
index 8c1b5df..287da34 100644
--- a/cmd/ubi.c
+++ b/cmd/ubi.c
@@ -248,7 +248,7 @@
 
 static struct ubi_volume *ubi_find_volume(char *volume)
 {
-	struct ubi_volume *vol = NULL;
+	struct ubi_volume *vol;
 	int i;
 
 	for (i = 0; i < ubi->vtbl_slots; i++) {
@@ -355,7 +355,7 @@
 
 static int ubi_volume_continue_write(char *volume, void *buf, size_t size)
 {
-	int err = 1;
+	int err;
 	struct ubi_volume *vol;
 
 	vol = ubi_find_volume(volume);
@@ -391,8 +391,8 @@
 int ubi_volume_begin_write(char *volume, void *buf, size_t size,
 	size_t full_size)
 {
-	int err = 1;
-	int rsvd_bytes = 0;
+	int err;
+	int rsvd_bytes;
 	struct ubi_volume *vol;
 
 	vol = ubi_find_volume(volume);
@@ -573,7 +573,7 @@
 int ubi_part(char *part_name, const char *vid_header_offset)
 {
 	struct mtd_info *mtd;
-	int err = 0;
+	int err;
 
 	if (ubi && ubi->mtd && !strcmp(ubi->mtd->name, part_name)) {
 		printf("UBI partition '%s' already selected\n", part_name);
@@ -604,7 +604,7 @@
 
 static int do_ubi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
-	int64_t size = 0;
+	int64_t size;
 	ulong addr = 0;
 	bool skipcheck = false;