Rename a variable in FreeIMPI (WolfSSL support)

[thiagoftsm]

Summary

This PR address an issue reported on Slack:

[105/370] Building C object CMakeFiles/freeipmi.plugin.dir/src/collectors/freeipmi.plugin/freeipmi_plugin.c.o
FAILED: CMakeFiles/freeipmi.plugin.dir/src/collectors/freeipmi.plugin/freeipmi_plugin.c.o 
/usr/bin/cc -D_GNU_SOURCE -I/usr/include/uuid -I/home/stelios/git/netdata/cmake-build-debug -I/home/stelios/git/netdata/src -I/usr/include/json-c -I/home/stelios/git/netdata/src/libnetdata/libjudy/src -I/home/stelios/git/netdata/src/libnetdata/libjudy/src/JudyCommon -Wall -Wextra -Wmaybe-uninitialized -g -std=gnu11 -fdiagnostics-color=always -ffunction-sections -fdata-sections -Wno-builtin-macro-redefined -fexceptions -MD -MT CMakeFiles/freeipmi.plugin.dir/src/collectors/freeipmi.plugin/freeipmi_plugin.c.o -MF CMakeFiles/freeipmi.plugin.dir/src/collectors/freeipmi.plugin/freeipmi_plugin.c.o.d -o CMakeFiles/freeipmi.plugin.dir/src/collectors/freeipmi.plugin/freeipmi_plugin.c.o -c /home/stelios/git/netdata/src/collectors/freeipmi.plugin/freeipmi_plugin.c
/home/stelios/git/netdata/src/collectors/freeipmi.plugin/freeipmi_plugin.c:108:5: error: 'protocol_version' redeclared as different kind of symbol
  108 | int protocol_version = -1;      // IPMI_MONITORING_PROTOCOL_VERSION_1_5, etc. or -1 for default
      |     ^~~~~~~~~~~~~~~~
In file included from /home/stelios/git/netdata/src/libnetdata/ssl/ssl.h:32,
                 from /home/stelios/git/netdata/src/libnetdata/libnetdata.h:486,
                 from /home/stelios/git/netdata/src/collectors/freeipmi.plugin/freeipmi_plugin.c:22:
/usr/include/wolfssl/ssl.h:761:5: note: previous definition of 'protocol_version' with type 'enum AlertDescription'
  761 |     protocol_version                =  70,

Test Plan

Additional Information

For users: How does this change affect me?

[ilyam8]

You missed

netdata/src/collectors/freeipmi.plugin/freeipmi_plugin.c

Line 1882 in 05dd823

else if (protocol_version < 0 || protocol_version == IPMI_MONITORING_PROTOCOL_VERSION_1_5) {