Cursed welded quarterstaff doesn't prevent spellcasting

doc/fixes3-7-0.txt

@@ -1338,6 +1338,7 @@ amulet of unchanging cannot be polymorphed
 wishing for a "lit candle" provided one, but the feedback as it was added into
 	invent was "partly used candle (lit)" because of how 'lit' timer works
 don't fall off steed because of Fumbling if saddle is cursed
+cursed welded quarterstaff doesn't prevent spellcasting
 
 
 Fixes to 3.7.0-x General Problems Exposed Via git Repository

src/spell.c

@@ -673,7 +673,7 @@ rejectcasting(void)
     } else if (!can_chant(&gy.youmonst)) {
         You("are unable to chant the incantation.");
         return TRUE;
-    } else if (!freehand()) {
+    } else if (!freehand() && !(uwep && uwep->otyp == QUARTERSTAFF)) {
         /* Note: !freehand() occurs when weapon and shield (or two-handed
          * weapon) are welded to hands, so "arms" probably doesn't need
          * to be makeplural(bodypart(ARM)).