Re-enable several MSVC warnings

Re-enable the following warnings:
 4245: signed/unsigned conversion mismatch;
 4310: cast may truncate data;
 4389: operator on signed/unsigned mismatch;
 4701: use potentially uninitialized local variable;
 4706: assignment within conditional expression

Clean up the code to avoid those warnings.

BUG=pdfium:29
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1801383002 .

1 files changed, 3 insertions, 3 deletions

diff --git a/core/fxcodec/codec/fx_codec_tiff.cpp b/core/fxcodec/codec/fx_codec_tiff.cpp
index 2af92f2f12..0312622fb4 100644
--- a/core/fxcodec/codec/fx_codec_tiff.cpp
+++ b/core/fxcodec/codec/fx_codec_tiff.cpp
@@ -122,20 +122,20 @@ static toff_t _tiff_seek(thandle_t context, toff_t offset, int whence) {
     case 2:
       if (pTiffContext->isDecoder) {
         if (pTiffContext->io.in->GetSize() < (FX_FILESIZE)offset) {
-          return -1;
+          return static_cast<toff_t>(-1);
         }
         pTiffContext->offset =
             (FX_DWORD)(pTiffContext->io.in->GetSize() - offset);
       } else {
         if (pTiffContext->io.out->GetSize() < (FX_FILESIZE)offset) {
-          return -1;
+          return static_cast<toff_t>(-1);
         }
         pTiffContext->offset =
             (FX_DWORD)(pTiffContext->io.out->GetSize() - offset);
       }
       break;
     default:
-      return -1;
+      return static_cast<toff_t>(-1);
   }
   ASSERT(pTiffContext->isDecoder ? (pTiffContext->offset <=
                                     (FX_DWORD)pTiffContext->io.in->GetSize())