spnego_sspi: add typecast to fix build warning

Reported in build "Win32 target on Debian Stretch (64-bit) -
i686-w64-mingw32 - gcc-20170516"

Closes #4245

diff --git a/lib/vauth/spnego_sspi.c b/lib/vauth/spnego_sspi.c
index a4935276b020baff06fe6123bd753f79d946b404..13d7a4cfe2e48b9936520b8c6f830a2894a0accb 100644 (file)
--- a/lib/vauth/spnego_sspi.c
+++ b/lib/vauth/spnego_sspi.c
@@ -252,7 +252,7 @@ CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
     failf(data, "InitializeSecurityContext failed: %s",
           Curl_sspi_strerror(nego->status, buffer, sizeof(buffer)));
 
-    if(nego->status == SEC_E_INSUFFICIENT_MEMORY)
+    if(nego->status == (DWORD)SEC_E_INSUFFICIENT_MEMORY)
       return CURLE_OUT_OF_MEMORY;
 
     return CURLE_AUTH_ERROR;
@@ -266,7 +266,7 @@ CURLcode Curl_auth_decode_spnego_message(struct Curl_easy *data,
       failf(data, "CompleteAuthToken failed: %s",
             Curl_sspi_strerror(nego->status, buffer, sizeof(buffer)));
 
-      if(nego->status == SEC_E_INSUFFICIENT_MEMORY)
+      if(nego->status == (DWORD)SEC_E_INSUFFICIENT_MEMORY)
         return CURLE_OUT_OF_MEMORY;
 
       return CURLE_AUTH_ERROR;