Update ngx_http_upload_module.c

[passerbya]

Repair 1 byte in state file error: state file "***.state" is corrupt. Like this: 10-10/72845543

[codecov]

Codecov Report

Merging #115 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #115   +/-   ##
=======================================
  Coverage   72.26%   72.26%           
=======================================
  Files           1        1           
  Lines        1648     1648           
=======================================
  Hits         1191     1191           
  Misses        457      457

Impacted Files	Coverage Δ
ngx_http_upload_module.c	72.26% <100%> (ø)	⬆️

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[passerbya]

This bug is easy to reproduce. Execute the following command twice.

curl http://localhost:8081/upload/ -d a -H "Content-Type: text/xml" -H "Content-Disposition: attachment; filename=big.TXT" -H "X-Content-Range: bytes 1-1/111414930" -H "Session-ID: 1111215057" -v

The first execution of the command returns success, the state file created like this:1-1/111414930.
But the second execution of the command returns error: state file "***.state" is corrupt. The debug log show this: inconsistent bounds while parsing range: 1-1/111414930.

[passerbya]

@vkholodkov @fdintino Could you please merge my code?