Fixed bug in update

zsh/update.zsh

@@ -59,7 +59,9 @@ update-rust() {
 
     # Update rust if installed
     command -v rustup > /dev/null 2>&1
-    if [ $? -eq 0 ]; then
+    if [ $? -ne 0 ]; then
+        return
+    fi
 
     start_rust_update=`date +%s`
     echo "\033[32;1m=== Updating rustup ===\033[0m"
@@ -111,7 +113,6 @@ update-rust() {
 
     echo "\033[32;1m=== Updating rust packages ===\033[0m"
     cargo install-update -ag
-    fi
 
     seconds=$((`date +%s` - $start_rust_update ))
     formatted=`date -ud "@$seconds" +'%H hours %M minutes %S seconds'`