fix fs not close,when dvr error

[x-falcon]

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[codecov-io]

Codecov Report

Merging #1672 into 3.0release will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           3.0release    #1672   +/-   ##
===========================================
  Coverage       52.88%   52.88%           
===========================================
  Files              82       82           
  Lines           26628    26629    +1     
===========================================
+ Hits            14082    14083    +1     
  Misses          12546    12546           

| Impacted Files | Coverage Δ | |'

Translated to English while maintaining the markdown structure:

'| Impacted Files | Coverage Δ | |
|---|---|---|
| trunk/src/app/srs_app_dvr.cpp | 0.00% <0.00%> (ø) | |
| trunk/src/service/srs_service_utility.cpp | 77.84% <0.00%> (ø) | |'

Translated to English while maintaining the markdown structure:

'| trunk/src/app/srs_app_dvr.cpp | 0.00% <0.00%> (ø) | |
| trunk/src/service/srs_service_utility.cpp | 77.84% <0.00%> (ø) | |
| trunk/src/core/srs_core_autofree.hpp | 100.00% <0.00%> (+11.11%) | ⬆️ |

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| Δ = absolute <relative> (impact), ø = not affected, ? = missing data'

Translated to English while maintaining the markdown structure:

'| Δ = absolute <relative> (impact), ø = not affected, ? = missing data

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