Add some missing va_ends. Reported by jmarsh

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@4227

src/cpu/core_dyn_x86/risc_x86.h

@@ -769,6 +769,7 @@ static void gen_call_function(void * func,char const* ops,...) {
 			}
 			ops++;
 		}
+		va_end(params);
 
 #if defined (MACOSX)
 		/* align stack */

src/debug/debug_disasm.cpp

@@ -490,6 +490,7 @@ static void uprintf(char const *s, ...)
 	va_list	arg_ptr;
 	va_start (arg_ptr, s);
 	vsprintf(ubufp, s, arg_ptr);
+	va_end(arg_ptr);
 	while (*ubufp)
 		ubufp++;
 }

src/libs/zmbv/zmbv_vfw.cpp

@@ -50,6 +50,7 @@ void Msg(const char fmt[], ...) {
   
   va_start(val, fmt);
   wvsprintf(buf, fmt, val);
+  va_end(val);
 
   const COORD _80x50 = {80,50};
   static BOOL startup = (AllocConsole(), SetConsoleScreenBufferSize(GetStdHandle(STD_OUTPUT_HANDLE), _80x50));