Consistent constants for radio data table sizes (could still be better)

engine/events/buena.asm

@@ -262,9 +262,7 @@ Buena_PrizeMenu:
 	dba .prizeitem
 	dba .prizepoints
 
-NUM_BUENA_PRIZES EQU 9 ; ((BuenaPrizeItems.End - BuenaPrizeItems) / 2)
-
-.indices
+.indices:
 	db NUM_BUENA_PRIZES
 x = 1
 rept NUM_BUENA_PRIZES
@@ -273,7 +271,7 @@ x = x + 1
 endr
 	db -1
 
-.prizeitem
+.prizeitem:
 	ld a, [wMenuSelection]
 	call Buena_getprize
 	ld a, [hl]
@@ -284,7 +282,7 @@ endr
 	call PlaceString
 	ret
 
-.prizepoints
+.prizepoints:
 	ld a, [wMenuSelection]
 	call Buena_getprize
 	inc hl

engine/overworld/wildmons.asm

@@ -705,11 +705,14 @@ JumpRoamMons:
 JumpRoamMon:
 .loop
 	ld hl, RoamMaps
-.innerloop1                   ; This loop happens to be unnecessary.
-	call Random               ; Choose a random number.
-	maskbits NUM_ROAMMON_MAPS ; Mask the number to limit it between 0 and 15.
-	cp NUM_ROAMMON_MAPS       ; If the number is not less than 16, try again.
-	jr nc, .innerloop1        ; I'm sure you can guess why this check is bogus.
+.innerloop1
+	; 0-15 are all valid indexes into RoamMaps,
+	; so this retry loop is unnecessary
+	; since NUM_ROAMMON_MAPS happens to be 16
+	call Random
+	maskbits NUM_ROAMMON_MAPS
+	cp NUM_ROAMMON_MAPS
+	jr nc, .innerloop1
 	inc a
 	ld b, a
 .innerloop2 ; Loop to get hl to the address of the chosen roam map.

engine/pokegear/radio.asm

@@ -194,10 +194,10 @@ OaksPKMNTalk4:
 ; Choose a random route, and a random Pokemon from that route.
 .sample
 	call Random
-	and %11111
-	cp (OaksPKMNTalkRoutes.End - OaksPKMNTalkRoutes) / 2
+	and %11111 ; maskbits NUM_OAKS_POKEMON_TALK_ROUTES would be more efficient
+	cp NUM_OAKS_POKEMON_TALK_ROUTES
 	jr nc, .sample
-	; We now have a number between 0 and 14.
+	; We now have a number between 0 and NUM_OAKS_POKEMON_TALK_ROUTES - 1.
 	ld hl, OaksPKMNTalkRoutes
 	ld c, a
 	ld b, 0