kernel32/tests: make sure to use return values (LLVM/Clang)

[Austin English]

https://testbot.winehq.org/JobDetails.pl?Key=9334

-- 
-Austin
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diff --git a/dlls/kernel32/tests/file.c b/dlls/kernel32/tests/file.c
index 375b5f0..8a95c71 100644
--- a/dlls/kernel32/tests/file.c
+++ b/dlls/kernel32/tests/file.c
@@ -179,6 +179,8 @@ static void test__hwrite( void )
 
     contents = LocalLock( memory_object );
 
+    ok( NULL != contents, "LocalLock whines\n" );
+
     filehandle = _lopen( filename, OF_READ );
 
     contents = LocalLock( memory_object );
@@ -542,6 +544,8 @@ static void test__lwrite( void )
 
     contents = LocalLock( memory_object );
 
+    ok( NULL != contents, "LocalLock whines\n" );
+
     filehandle = _lopen( filename, OF_READ );
 
     contents = LocalLock( memory_object );
@@ -2094,7 +2098,7 @@ static void test_FindFirstFileA(void)
     strcat(buffer2, "nul");
     handle = FindFirstFileA(buffer2, &data);
     err = GetLastError();
-    ok( handle != INVALID_HANDLE_VALUE, "FindFirstFile on %s failed\n", buffer2 );
+    ok( handle != INVALID_HANDLE_VALUE, "FindFirstFile on %s failed: %d\n", buffer2, err );
     ok( 0 == lstrcmpiA(data.cFileName, "nul"), "wrong name %s\n", data.cFileName );
     ok( FILE_ATTRIBUTE_ARCHIVE == data.dwFileAttributes ||
         FILE_ATTRIBUTE_DEVICE == data.dwFileAttributes /* Win9x */,
@@ -2114,7 +2118,7 @@ static void test_FindFirstFileA(void)
     strcpy(buffer2, "lpt1");
     handle = FindFirstFileA(buffer2, &data);
     err = GetLastError();
-    ok( handle != INVALID_HANDLE_VALUE, "FindFirstFile on %s failed\n", buffer2 );
+    ok( handle != INVALID_HANDLE_VALUE, "FindFirstFile on %s failed: %d\n", buffer2, err );
     ok( 0 == lstrcmpiA(data.cFileName, "lpt1"), "wrong name %s\n", data.cFileName );
     ok( FILE_ATTRIBUTE_ARCHIVE == data.dwFileAttributes ||
         FILE_ATTRIBUTE_DEVICE == data.dwFileAttributes /* Win9x */,