Remove adding of bogus hwmon label entries

If we fail to find an expected temperature or voltage label
file, previously we were attempting to re-add a mapping of file
index to sensor types. Attempting to insert a map item that is already
present has no effect, so there should be no functional change.

This was a remnant of old code that should have been deleted.

Change-Id: Ie6f8a62f619a1ae58756e0fd891532434518cf78


[ROCm/rocm_smi_lib commit: bb5132a66c]

projects/rocm-smi-lib/src/rocm_smi_monitor.cc

@@ -335,7 +335,6 @@ Monitor::setTempSensorLabelMap(void) {
       temp_type_index_map_[t_type] = file_index;
       index_temp_type_map_.insert({file_index, t_type});
     }
-    index_temp_type_map_.insert({file_index, t_type});
     return 0;
   };
 
@@ -373,7 +372,6 @@ Monitor::setVoltSensorLabelMap(void) {
       volt_type_index_map_.insert({t_type, file_index});
       index_volt_type_map_.insert({file_index, t_type});
     }
-    index_volt_type_map_.insert({file_index, t_type});
     return 0;
   };