Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
index c8fcbdd..dc80d82 100644
--- a/include/linux/ethtool.h
+++ b/include/linux/ethtool.h
@@ -614,7 +614,7 @@
  * values of corresponding bits in features[].requested. Bits in .requested
  * not set in .valid or not changeable are ignored.
  *
- * Returns %EINVAL when .valid contains undefined or never-changable bits
+ * Returns %EINVAL when .valid contains undefined or never-changeable bits
  * or size is not equal to required number of features words (32-bit blocks).
  * Returns >= 0 if request was completed; bits set in the value mean:
  *   %ETHTOOL_F_UNSUPPORTED - there were bits set in .valid that are not