fix #H7487 - dead with non-zero HP

Report was for being fried by angry deity.  There are lots of deaths
that don't involve subtracting HP until it hits 0 or less; I haven't
bothered tracking down which ones don't set u.uhp to 0 before they
call done().

No effect on life-saving or declining to die except for HP:0 being
visible on the status line during their messages.

doc/fixes36.2

@@ -176,6 +176,8 @@ prayer result which enhanced strength (fix weakness from hunger) didn't give
 	a message if a change in encumbrance occurred; it came on next move
 add current location within the dungeon to the Background section of ^X and
 	final disclosure (it's not background but doesn't fit anywhere else)
+death from something other than loss of hit points could leave hero with
+	non-zero HP at end of game (during "really die?" prompt, disclosure)
 
 
 Fixes to Post-3.6.1 Problems that Were Exposed Via git Repository

src/end.c

@@ -1037,8 +1037,17 @@ int how;
     if (!killer.name[0] || how >= PANICKED)
         Strcpy(killer.name, deaths[how]);
 
-    if (how < PANICKED)
+    if (how < PANICKED) {
         u.umortality++;
+        /* in case caller hasn't already done this */
+        if (u.uhp > 0 || (Upolyd && u.mh > 0)) {
+            /* for deaths not triggered by loss of hit points, force
+               current HP to zero (0 HP when turning into green slime
+               is iffy but we don't have much choice--that is fatal) */
+            u.uhp = u.mh = 0;
+            context.botl = 1;
+        }
+    }
     if (Lifesaved && (how <= GENOCIDED)) {
         pline("But wait...");
         makeknown(AMULET_OF_LIFE_SAVING);