gdb/alpha-tdep: add empty line

This was suggested in review, to separate the comment from the following
code.

Change-Id: I077ad4545ee5ef1d362dcfacf585400e26dfdb29
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c
index 5e8a7a0..d655c13 100644
--- a/gdb/alpha-tdep.c
+++ b/gdb/alpha-tdep.c
@@ -1829,6 +1829,7 @@ INIT_GDB_FILE (alpha_tdep)
   gdbarch_register (bfd_arch_alpha, alpha_gdbarch_init, NULL);
 
   initialize_tdesc_alpha ();
+
   /* Let the user set the fence post for heuristic_proc_start.  */
 
   /* We really would like to have both "0" and "unlimited" work, but