Introduce IsDiabloMsgAvailable and hide msgflag

Source/diablo.cpp

@@ -1737,7 +1737,7 @@ bool PressEscKey()
 		rv = true;
 	}
 
-	if (msgflag != EMSG_NONE) {
+	if (IsDiabloMsgAvailable()) {
 		msgdelay = 0;
 		rv = true;
 	}

Source/error.cpp

@@ -14,12 +14,12 @@
 namespace devilution {
 
 uint32_t msgdelay;
-diablo_message msgflag;
 
 namespace {
 
 diablo_message msgtable[MAX_SEND_STR_LEN];
 uint8_t msgcnt;
+diablo_message msgflag;
 
 } // namespace
 
@@ -99,6 +99,11 @@ void InitDiabloMsg(diablo_message e)
 	msgdelay = SDL_GetTicks();
 }
 
+bool IsDiabloMsgAvailable()
+{
+	return msgflag != EMSG_NONE;
+}
+
 void ClrDiabloMsg()
 {
 	for (auto &msg : msgtable)

Source/error.h

@@ -70,9 +70,9 @@ enum diablo_message : uint8_t {
 };
 
 extern uint32_t msgdelay;
-extern diablo_message msgflag;
 
 void InitDiabloMsg(diablo_message e);
+bool IsDiabloMsgAvailable();
 void ClrDiabloMsg();
 void DrawDiabloMsg(const Surface &out);
 

Source/scrollrt.cpp

@@ -1230,7 +1230,7 @@ void DrawView(const Surface &out, int startX, int startY)
 	if (HelpFlag) {
 		DrawHelp(out);
 	}
-	if (msgflag != EMSG_NONE) {
+	if (IsDiabloMsgAvailable()) {
 		DrawDiabloMsg(out);
 	}
 	if (MyPlayerIsDead) {