Merge declaration and initialization.

src/zaxis.c

@@ -297,9 +297,7 @@ static void zaxisDestroyKernel( zaxis_t * zaxisptr )
 */
 void zaxisDestroy(int zaxisID)
 {
-  zaxis_t *zaxisptr;
-
-  zaxisptr = ( zaxis_t * ) reshGetVal ( zaxisID, &zaxisOps );
+  zaxis_t *zaxisptr = reshGetVal(zaxisID, &zaxisOps);
 
   zaxisDestroyKernel ( zaxisptr );
 }