cmd: ubi: remove unnecessary logical constraint

A size_t variable can never be negative.

The problem was indicated by cppcheck.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/cmd/ubi.c b/cmd/ubi.c
index efc43ff..222be5a 100644
--- a/cmd/ubi.c
+++ b/cmd/ubi.c
@@ -308,7 +308,7 @@
 		return ENODEV;
 
 	rsvd_bytes = vol->reserved_pebs * (ubi->leb_size - vol->data_pad);
-	if (size < 0 || size > rsvd_bytes) {
+	if (size > rsvd_bytes) {
 		printf("size > volume size! Aborting!\n");
 		return EINVAL;
 	}