use correct integer types

src/fs.cpp

@@ -151,7 +151,7 @@ namespace fs
       return -1;
 
     dev = st.st_dev;
-    for(int i = 0, ei = srcmounts.size(); i != ei; i++)
+    for(size_t i = 0, ei = srcmounts.size(); i != ei; i++)
       {
         fs::path::make(&srcmounts[i],fusepath,fullpath);
 
@@ -223,7 +223,7 @@ namespace fs
       const uint64_t        minfreespace,
       string               &path)
   {
-    fsblkcnt_t mfs;
+    uint64_t mfs;
     const string *mfsbasepath;
 
     mfs = 0;