libmsc/transaction.c: cosmetic: fix typo

Change-Id: I6d72b856e40ba81ee2f1e60693055705b5993b09
diff --git a/src/libmsc/transaction.c b/src/libmsc/transaction.c
index be14420..680d7f3 100644
--- a/src/libmsc/transaction.c
+++ b/src/libmsc/transaction.c
@@ -35,7 +35,7 @@
 void _gsm911_nc_ss_trans_free(struct gsm_trans *trans);
 
 /*! Find a transaction in connection for given protocol + transaction ID
- * \param[in] conn Connection in whihc we want to find transaction
+ * \param[in] conn Connection in which we want to find transaction
  * \param[in] proto Protocol of transaction
  * \param[in] trans_id Transaction ID of transaction
  * \returns Matching transaction, if any