[m-rev.] diff: avoid C compiler warning in low-level C grades

[Julien Fischer]

Branches: main, 11.07

Avoid a C compiler warning in low-level C grades that do not use non-local
gotos.

runtime/mercury_engine.c:
 	Add a return statement to the function engine_done in order to
 	avoid a warning about it being missing.  (Since we longjump out
 	of that function it won't ever be executed.)

Julien.

Index: runtime/mercury_engine.c
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/runtime/mercury_engine.c,v
retrieving revision 1.68
diff -u -r1.68 mercury_engine.c
--- runtime/mercury_engine.c	16 Oct 2011 03:34:39 -0000	1.68
+++ runtime/mercury_engine.c	11 Jan 2012 05:12:46 -0000
@@ -638,6 +638,7 @@
      MR_save_registers();
      MR_debugmsg0("longjmping out...\n");
      longjmp(*(MR_ENGINE(MR_eng_jmp_buf)), 1);
+    return NULL;    /* Not executed, but required to suppress warnings. */
  }

  static MR_Code *


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