win/ntfs: remove unused variable and have ntfssect use char API calls

The variable 'ok' is never used and generates a warning. Remove it.
Also ntfssect.c is designed to be compiled in non Unicode mode when
using MSVC compilers, so remove all ambiguity about it
(LPCTSTR -> LPCSTR, use of 'A' API calls) so that it doesn't break when
compiled in Unicode mode, which is what Rufus uses with MSVC.

Signed-off-by: Pete Batard <pete@akeo.ie>

win/ntfssect.c

@@ -45,7 +45,7 @@ DWORD M_NTFSSECT_API NtfsSectGetFileVcnExtent(
     LARGE_INTEGER * Vcn,
     S_NTFSSECT_EXTENT * Extent
   ) {
-    BOOL bad, ok;
+    BOOL bad;
     DWORD output_size, rc;
     STARTING_VCN_INPUT_BUFFER input;
     RETRIEVAL_POINTERS_BUFFER output;
@@ -60,7 +60,7 @@ DWORD M_NTFSSECT_API NtfsSectGetFileVcnExtent(
       return ERROR_INVALID_PARAMETER;
 
     input.StartingVcn = *Vcn;
-    ok = DeviceIoControl(
+    DeviceIoControl(
         File,
         FSCTL_GET_RETRIEVAL_POINTERS,
         &input,
@@ -112,7 +112,7 @@ static DWORD NtfsSectGetVolumeHandle(
       c[-1] = 0;
 
     /* Open the volume */
-    VolumeInfo->Handle = CreateFile(
+    VolumeInfo->Handle = CreateFileA(
         volname,
         GENERIC_READ,
         FILE_SHARE_READ | FILE_SHARE_WRITE,
@@ -302,7 +302,7 @@ DWORD M_NTFSSECT_API NtfsSectLoadXpFuncs(S_NTFSSECT_XPFUNCS * XpFuncs) {
 
     XpFuncs->Size = sizeof *XpFuncs;
 
-    XpFuncs->Kernel32 = LoadLibrary("kernel32.dll");
+    XpFuncs->Kernel32 = LoadLibraryA("kernel32.dll");
     rc = GetLastError();
     if (!XpFuncs->Kernel32) {
         M_ERR("KERNEL32.DLL not found!");

win/ntfssect.h

@@ -39,15 +39,15 @@ typedef struct S_NTFSSECT_XPFUNCS_ S_NTFSSECT_XPFUNCS;
 
 /* The function type for Kernel32.dll's GetDiskFreeSpace() */
 typedef BOOL WINAPI F_KERNEL32_GETDISKFREESPACE(
-    LPCTSTR,
+    LPCSTR,
     LPDWORD,
     LPDWORD,
     LPDWORD,
     LPDWORD
   );
 
 /* The function type for Kernel32.dll's GetVolumePathName() */
-typedef BOOL WINAPI F_KERNEL32_GETVOLUMEPATHNAME(LPCTSTR, LPCTSTR, DWORD);
+typedef BOOL WINAPI F_KERNEL32_GETVOLUMEPATHNAME(LPCSTR, LPCSTR, DWORD);
 
 /*** Function declarations */