[driver] Search for "NOGUIBOOT" instead of "/NOGUIBOOT"

In Windows Vista and above, the kernel command line synthesised by the
bootloader omits the slashes traditionally found in the old-style
BOOT.INI file.

Reported-by: Tal Aloni <tal.aloni.il@gmail.com>
Signed-off-by: Michael Brown <mbrown@fensystems.co.uk>

src/driver/boottext.c

@@ -62,7 +62,7 @@ VOID NTAPI InbvSolidColorFill ( IN ULONG Left, IN ULONG Top, IN ULONG Width,
 				IN ULONG Height, IN ULONG Color );
 VOID NTAPI InbvSetProgressBarSubset ( IN ULONG Floor, IN ULONG Ceiling );
 
-/** Graphical boot is enabled (i.e. /NOGUIBOOT switch is not present) */
+/** Graphical boot is enabled (i.e. NOGUIBOOT switch is not present) */
 BOOLEAN guiboot_enabled = TRUE;
 
 /** Boot text is enabled */

src/driver/sanbootconf.c

@@ -99,10 +99,10 @@ static NTSTATUS load_start_options ( VOID ) {
 	}
 	DbgPrint ( "SystemStartOptions are %S\n", options );
 
-	/* Check for /NOGUIBOOT option */
+	/* Check for NOGUIBOOT option */
 	for ( optchar = options ; *optchar ; optchar++ )
 		*optchar = towupper ( *optchar );
-	if ( wcsstr ( options, L"/NOGUIBOOT" ) != NULL )
+	if ( wcsstr ( options, L"NOGUIBOOT" ) != NULL )
 		guiboot_enabled = FALSE;
 	DbgPrint ( "Graphical boot is %s\n",
 		   ( guiboot_enabled ? "enabled" : "disabled" ) );