rocm_smi_lib: Fix rocm-smi --showfan shows 'unable to detect fan'

Code changes related to the following:
  * Reverts earlier fix for the same issue
  * Check for existence of files before reading

Change-Id: I175b20c3343c414b12b79dc3fc404f53fbaabf3a
Signed-off-by: Oliveira, Daniel <daniel.oliveira@amd.com>


[ROCm/rocm_smi_lib commit: 328ce0150b]

projects/rocm-smi-lib/python_smi_tools/rocm_smi.py

@@ -785,12 +785,8 @@ def resetFans(deviceList):
     for device in deviceList:
         sensor_ind = c_uint32(0)
         ret = rocmsmi.rsmi_dev_fan_reset(device, sensor_ind)
-        if (ret == rsmi_status_t.RSMI_STATUS_NOT_SUPPORTED) or (ret == rsmi_status_t.RSMI_STATUS_PERMISSION):
-            if not rsmi_ret_ok(rsmi_status_t.RSMI_STATUS_NOT_SUPPORTED, device, 'reset_fan'):
-                continue
-        else:
-            if rsmi_ret_ok(ret, device, 'reset_fan'):
-                printLog(device, 'Successfully reset fan speed to driver control', None)
+        if rsmi_ret_ok(ret, device, 'reset_fan'):
+            printLog(device, 'Successfully reset fan speed to driver control', None)
     printLogSpacer()