snmpapi: SnmpUtilDbgPrint() is a vararg and not an stdcall function.

dlls/snmpapi/main.c

@@ -136,8 +136,15 @@ BOOL WINAPI DllMain(
 
 /***********************************************************************
  *      SnmpUtilDbgPrint        (SNMPAPI.@)
+ *
+ * NOTES
+ *  The Microsoft headers claim this function uses the stdcall calling
+ *  convention. But stdcall functions cannot take a variable number of
+ *  arguments so this does not make sense. The stdcall specification is
+ *  probably ignored by Microsoft's compiler in this case. So declare it
+ *  correctly in Wine so it works with all compilers.
  */
-void WINAPI SnmpUtilDbgPrint(INT loglevel, LPSTR format, ...)
+void WINAPIV SnmpUtilDbgPrint(INT loglevel, LPSTR format, ...)
 {
     FIXME("(%d, %s)\n", loglevel, debugstr_a(format));
 }

dlls/snmpapi/snmpapi.spec

@@ -20,7 +20,7 @@
 @ stub SnmpUtilAnsiToUnicode
 @ stdcall SnmpUtilAsnAnyCpy(ptr ptr)
 @ stdcall SnmpUtilAsnAnyFree(ptr)
-@ stdcall SnmpUtilDbgPrint(long str)
+@ varargs SnmpUtilDbgPrint(long str)
 @ stdcall SnmpUtilIdsToA(ptr long)
 @ stdcall SnmpUtilMemAlloc(long)
 @ stdcall SnmpUtilMemFree(ptr)

include/snmp.h

@@ -289,7 +289,7 @@ DWORD WINAPI SnmpSvcGetUptime(void);
 void WINAPI SnmpSvcSetLogLevel(int nLogLevel);
 void WINAPI SnmpSvcSetLogType(int nLogType);
 
-void WINAPI SnmpUtilDbgPrint(int nLogLevel, LPSTR szFormat, ...);
+void WINAPIV SnmpUtilDbgPrint(int nLogLevel, LPSTR szFormat, ...);
 
 #ifdef __cplusplus
 }