bit logic fix (trunk only)

Fix some expressions that were supposed to use bitwise '&' but were
accidentally using logical '&&', pointed out by Keni's lint tool.  All 3
instances are in post-3.4.3 code, so don't affect the branch and don't
need a fixes entry.

src/dogmove.c

@@ -1,5 +1,4 @@
 /* NetHack 3.5	dogmove.c	$Date$  $Revision$ */
-/*	SCCS Id: @(#)dogmove.c	3.5	2008/10/20	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -775,7 +774,7 @@ register int after;	/* this is extra fast monster movement */
 		    int mstatus;
 		    register struct monst *mtmp2 = m_at(nx,ny);
 		    mstatus = mdisplacem(mtmp, mtmp2, FALSE);	/* displace monster */
-		    if (mstatus && MM_DEF_DIED) return 2;
+		    if (mstatus & MM_DEF_DIED) return 2;
   		    return 0;
   		}
 #endif /* BARGETHROUGH */