configure.ac: Fix typo

Unbreak git-version-gen when used with .tarball-version

Change-Id: Id836c6822daf1f6835a8c869624b4b40dde47f3a
diff --git a/configure.ac b/configure.ac
index bade799..c80f1cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@
 dnl
 
 AC_INIT([osmo-trx],
-	m4_esyscmd([./git-version-gen .tarball-veresion]),
+	m4_esyscmd([./git-version-gen .tarball-version]),
 	[openbsc@lists.osmocom.org])
 AC_PREREQ(2.57)
 AC_CONFIG_SRCDIR([Transceiver52M/Makefile.am])