[sr-dev] [kamailio/kamailio] utils/db_berkeley: fixed unused var (#2136)

[sergey-safarov]

kambdb_recover.c: In function 'load_metadata_columns':
kambdb_recover.c:819:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable]
  819 |  int ret,n,len;
      |      ^~~

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#### Type Of Change
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- [ ] New feature (non-breaking change which adds new functionality)
- [ ] Breaking change (fix or feature that would change existing functionality)

#### Checklist:
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#### Description
Fixed not used vars on Fedora 31
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/2136

-- Commit Summary --

  * utils/db_berkeley: fixed unused var

-- File Changes --

    M utils/db_berkeley/kambdb_recover.c (4)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/2136.patch
https://github.com/kamailio/kamailio/pull/2136.diff

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