Use decompiled DungeonRand16Bit in dg_random

include/overlay_29_022EA9EC.h

@@ -12,6 +12,6 @@ typedef struct prng_state {
 } prng_state;
 
 void InitDungeonRng(u32 seed);
-u32 DungeonRand16Bit(void);
+u16 DungeonRand16Bit(void);
 
 #endif //PMDSKY_OVERLAY_29_022EA9EC_H

src/dg_random.c

@@ -1,9 +1,8 @@
 #include "dg_random.h"
+#include "overlay_29_022EA9EC.h"
 
 // file starts at 0x022ea968
 
-extern s16 DungeonRand16Bit(void);
-
 s32 DungeonRandInt(s32 end)
 {
     s32 entropy = DungeonRand16Bit();

src/overlay_29_022EA9EC.c

@@ -15,7 +15,7 @@ void InitDungeonRng(u32 seed) {
     } while (scratch_0<5);
 }
 
-u32 DungeonRand16Bit(void) {
+u16 DungeonRand16Bit(void) {
     u32 mult = DUNGEON_PRNG_LCG_MULTIPLIER;
 
     if (DUNGEON_PRNG_STATE.use_secondary) {