fix: script error (#228)

* fix script error

* apply review

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

Author: lightsing

Makefile

@@ -30,7 +30,7 @@ $(SRS_PARAMS_DIR)/%.srs:
 	fi
 
 download-release:
-	sh download-release.sh
+	bash download-release.sh
 
 upload-release:
 	@cargo run --bin scroll-zkvm-upload-axiom

download-release.sh

@@ -20,7 +20,7 @@ WARN_PREFIX="${YELLOW_BOLD}[!]${NC}"
 
 # select release version
 GUEST_VERSION="${GUEST_VERSION:-}"
-if [ -n "$1" ]; then
+if [ "$#" -gt 0 ]; then
   GUEST_VERSION="$1"
 fi
 if [ -z "$GUEST_VERSION" ]; then