[PATCH] Don't call fstat() on stdin in index-pack.

* Bart Trojanowski <bart@jukie.net> [070118 16:26]:
>       $ git push origin 
>       updating 'refs/heads/my-ocf+fsm_v2.6.18' 
>         from 0000000000000000000000000000000000000000 
>         to   380541e91358d7a5e2fe37c81c520c92a3094951 
>       Generating pack... 
>       Done counting 727 objects. 
>       Result has 708 objects. 
>       Deltifying 708 objects. 
>        100% (708/708) done 
>       Writing 708 objects. 
>        100% (708/708) done 
>       Total 708 (delta 535), reused 275 (delta 218) 
>       fatal: cannot fstat packfile: Value too large for defined data type 

I had a look at the code in index-pack.c and noticed that this error is
printed input_fd is set to 0 in open_pack_file().

|           if (fstat(input_fd, &st))
|                   die("cannot fstat packfile: %s", strerror(errno));
|           if (S_ISREG(st.st_mode) && st.st_size != consumed_bytes)
|                   die("pack has junk at the end");

It seems strange to me to call fstat on fd 0 to get st_size info.

Granted, st_mode should tell us that it's not a regular file, but
already know it's not a regular file.

So I removed it.  And now it works (I verified that the git-diff output
on both sides matches).

-Bart

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