Revert "utils: fix typo in hwmon."

This reverts commit 0fa87f9a892ba345d3cc657e16c5ca2a71ef9dc6.

BUG=1016189

Original change's description:
> utils: fix typo in hwmon.
> 
> Not caching the paths probably caused minor performance issues
> in perf tests.
> 
> BUG=None.
> TEST=None.
> 
> Change-Id: I94c6eb4a2e9cf2b21956a3083cc295a364ad7d31
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1867752
> Tested-by: Ilja H. Friedel <ihf@chromium.org>
> Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
> Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>

Bug: None.
Change-Id: Ie5e1b02d183c39a20cd1ca64b4a5d48149cfd984
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1870976
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>
Commit-Queue: Ilja H. Friedel <ihf@chromium.org>
Tested-by: Ilja H. Friedel <ihf@chromium.org>
(cherry picked from commit ba3c25ec0de010ec7d6e61cc40cf504d860028e3)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1870977
diff --git a/client/bin/utils.py b/client/bin/utils.py
index 04f33b1..d4f4e72 100644
--- a/client/bin/utils.py
+++ b/client/bin/utils.py
@@ -1865,8 +1865,8 @@
     #    /sys/devices/platform/coretemp.0/
     if not _hwmon_paths:
         cmd = 'find /sys/ -name "' + file_pattern + '"'
-        _hwmon_paths = utils.run(cmd, verbose=False).stdout.splitlines()
-    return _hwmon_paths
+        _hwon_paths = utils.run(cmd, verbose=False).stdout.splitlines()
+    return _hwon_paths
 
 
 def get_temperature_critical():