fix pyrolisk egg panic when eating from floor

From a change made about two and half months ago:  eating a pyrolisk
egg tried to use it up from inventory even when it was on the floor.
That would trigger an object lost panic.

doc/fixes3-7-0.txt

@@ -2012,6 +2012,7 @@ having #terrain display gas cloud regions as if they were traps didn't work
 	sensed via ESP
 when a monster within a gas cloud was displayed on the map because the hero
 	was next to it, it remained displayed if hero moved away
+eating a pyrolisk egg on the floor triggered an "object lost" panic
 
 
 Fixes to 3.7.0-x Platform and/or Interface Problems Exposed Via git Repository

src/eat.c

@@ -2028,7 +2028,10 @@ fprefx(struct obj *otmp)
     switch (otmp->otyp) {
     case EGG:
         if (otmp->corpsenm == PM_PYROLISK) {
-            useup(otmp);
+            if (carried(otmp))
+                useup(otmp);
+            else
+                useupf(otmp, 1L);
             explode(u.ux, u.uy, -11, d(3, 6), 0, EXPL_FIERY);
             return FALSE;
         } else if (stale_egg(otmp)) {
@@ -2842,8 +2845,8 @@ doeat(void)
 
 
     if (otmp == svc.context.victual.piece) {
-        boolean one_bite_left
-            = (svc.context.victual.usedtime + 1 >= svc.context.victual.reqtime);
+        boolean one_bite_left = (svc.context.victual.usedtime + 1
+                                 >= svc.context.victual.reqtime);
 
         /* If they weren't able to choke, they don't suddenly become able to
          * choke just because they were interrupted.  On the other hand, if