trivial: fix typo "varaible" -> "variable"

This patch was created by

	git grep -l '[vV]araible' | xargs -r -t perl -p -i -e 's/\b([Vv]ar)ai(bles?)\b/$1ia$2/g'

Signed-off-by: Uwe Kleine-Koenig <Uwe.Kleine-Koenig@digi.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c
index 00945f7..25c9ef6 100644
--- a/drivers/net/wan/farsync.c
+++ b/drivers/net/wan/farsync.c
@@ -69,7 +69,7 @@
 #endif
 
 /*
- * Modules parameters and associated varaibles
+ * Modules parameters and associated variables
  */
 static int fst_txq_low = FST_LOW_WATER_MARK;
 static int fst_txq_high = FST_HIGH_WATER_MARK;