[crush] Fix dependency scan loop.

Dependency count may change, and deps array length must be evaluated every loop.

crush.lua

@@ -263,7 +263,8 @@ local function run()
     mkdir("lib")
 
     -- NOTE: deps array may grow while scanning
-    for i = 1,#deps do
+    local i = 1
+    while i <= #deps do
         local dep = deps[i]
 
         -- Fetch dependency
@@ -275,6 +276,8 @@ local function run()
         if file_exists(depmanifest) then
             scandeps(depmanifest, 'skipdups', deps)
         end
+
+        i = i + 1
     end
 end