src: add libosmo_abis_init(void *ctx) to set the talloc context

This function is called during initialization, so we can set what's
the talloc context for the application and the library.
diff --git a/src/e1_input.c b/src/e1_input.c
index 8a4e1b9..fb3d9a6 100644
--- a/src/e1_input.c
+++ b/src/e1_input.c
@@ -605,6 +605,7 @@
 
 void e1inp_init(void)
 {
+	tall_e1inp_ctx = talloc_named_const(libosmo_abis_ctx, 1, "e1inp");
 	tall_sigl_ctx = talloc_named_const(tall_e1inp_ctx, 1,
 					   "e1inp_sign_link");
 	osmo_signal_register_handler(SS_GLOBAL, e1i_sig_cb, NULL);