efi: Use string literals for efi_char16_t variable initializers

Now that we unambiguously build the entire kernel with -fshort-wchar,
it is no longer necessary to open code efi_char16_t[] initializers as
arrays of characters, and we can move to the L"xxx" notation instead.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20180312084500.10764-6-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/platform/efi/quirks.c

@@ -75,7 +75,7 @@ struct quark_security_header {
 	u32 rsvd[2];
 };
 
-static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 };
+static const efi_char16_t efi_dummy_name[] = L"DUMMY";
 
 static bool efi_no_storage_paranoia;
 
@@ -105,7 +105,8 @@ early_param("efi_no_storage_paranoia", setup_storage_paranoia);
 */
 void efi_delete_dummy_variable(void)
 {
-	efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
+	efi.set_variable((efi_char16_t *)efi_dummy_name,
+			 &EFI_DUMMY_GUID,
 			 EFI_VARIABLE_NON_VOLATILE |
 			 EFI_VARIABLE_BOOTSERVICE_ACCESS |
 			 EFI_VARIABLE_RUNTIME_ACCESS,
@@ -182,7 +183,8 @@ efi_status_t efi_query_variable_store(u32 attributes, unsigned long size,
 		if (!dummy)
 			return EFI_OUT_OF_RESOURCES;
 
-		status = efi.set_variable(efi_dummy_name, &EFI_DUMMY_GUID,
+		status = efi.set_variable((efi_char16_t *)efi_dummy_name,
+					  &EFI_DUMMY_GUID,
 					  EFI_VARIABLE_NON_VOLATILE |
 					  EFI_VARIABLE_BOOTSERVICE_ACCESS |
 					  EFI_VARIABLE_RUNTIME_ACCESS,