[SQU] compiler warnings

I'm trying to compile Squid-2.4-200102160000 on Irix-6.5 with the
mipspro compiler.
After enabling some warnings, i saw some interesting stuff.

I got this very often (but i suppose is no big deal):

cc-1107 cc: WARNING File = structs.h, Line = 1869
  A signed bit field has a length of 1 bit.

        int closing:1;
            ^

But i also got this:

cc-1183 cc: WARNING File = wccp.c, Line = 228
  An unsigned integer is being compared to zero.

      if (len < 0)
              ^

And this (which seems more ugly):

cc-1183 cc: WARNING File = store_swapmeta.c, Line = 133
  An unsigned integer is being compared to zero.

        if (type < STORE_META_VOID || type > STORE_META_END) {
                 ^

Also, check this out:

cc-1188 cc: WARNING File = HttpRequest.c, Line = 139
  The indicated type qualifier is meaningless on cast type.

        strLen(req->urlpath) + 1 +
        ^

I also have some other warnings; if it's of any interest, i can send you
the entire list.

-- 
Florin Andrei
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