Initialise psFeature->lastHitWeapon to avoid valgrind warning found by Safety0ff.

Also changed lastHitWeapon from UDWORD to WEAPON_SUBCLASS.

src/action.c

@@ -891,7 +891,7 @@ void actionUpdateDroid(DROID *psDroid)
 			psDroid->actionStarted += (gameTime - psDroid->timeLastHit);
 			//reset the lastHit parameters
 			psDroid->timeLastHit = 0;
-			psDroid->lastHitWeapon = UDWORD_MAX;
+			psDroid->lastHitWeapon = WSC_NUM_WEAPON_SUBCLASSES;
 		}
 		else
 		{

src/basedef.h

@@ -81,7 +81,7 @@ typedef struct _tilePos
 	UBYTE               inFire;                     /**< true if the object is in a fire */ \
 	UWORD               numWatchedTiles;		/**< Number of watched tiles, zero for features */ \
 	UDWORD              lastEmission;               /**< When did it last puff out smoke? */ \
-	UDWORD              lastHitWeapon;		/**< The weapon that last hit it */ \
+	WEAPON_SUBCLASS     lastHitWeapon;              /**< The weapon that last hit it */ \
 	UDWORD              timeLastHit;		/**< The time the structure was last attacked */ \
 	UDWORD              body;			/**< Hit points with lame name */ \
 	UDWORD              burnStart;                  /**< When the object entered the fire */ \

src/droid.c

@@ -2540,7 +2540,7 @@ DROID *reallyBuildDroid(DROID_TEMPLATE *pTemplate, UDWORD x, UDWORD y, UDWORD pl
 	psDroid->lastEmission = 0;
 	psDroid->bTargetted = false;
 	psDroid->timeLastHit = UDWORD_MAX;
-	psDroid->lastHitWeapon = UDWORD_MAX;	// no such weapon
+	psDroid->lastHitWeapon = WSC_NUM_WEAPON_SUBCLASSES;  // no such weapon
 
 	// it was never drawn before
 	psDroid->sDisplay.frameNumber = 0;

src/feature.c

@@ -324,6 +324,7 @@ FEATURE * buildFeature(FEATURE_STATS *psStats, UDWORD x, UDWORD y,BOOL FromSave)
 	objEcmCache((BASE_OBJECT *)psFeature, NULL);
 	psFeature->bTargetted = false;
 	psFeature->timeLastHit = 0;
+	psFeature->lastHitWeapon = WSC_NUM_WEAPON_SUBCLASSES;  // no such weapon
 
 	// it has never been drawn
 	psFeature->sDisplay.frameNumber = 0;

src/structure.c

@@ -1745,7 +1745,7 @@ STRUCTURE* buildStructureDir(STRUCTURE_STATS *pStructureType, UDWORD x, UDWORD y
 
 		psBuilding->lastEmission = 0;
 		psBuilding->timeLastHit = 0;
-		psBuilding->lastHitWeapon = UDWORD_MAX;	// no such weapon
+		psBuilding->lastHitWeapon = WSC_NUM_WEAPON_SUBCLASSES;  // no such weapon
 
 		psBuilding->inFire = 0;
 		psBuilding->burnStart = 0;