fix a few linux compilation warnings

core/src/fxge/dib/fx_dib_transform.cpp

Index: core/src/fxge/dib/fx_dib_transform.cpp
diff --git a/core/src/fxge/dib/fx_dib_transform.cpp b/core/src/fxge/dib/fx_dib_transform.cpp
index 65afdd6b3aa7a6c57b3516704554326905a80b7d..a9a1e66d99ab0ba94b2dbe8e2a8bc9a0c8303151 100644
--- a/core/src/fxge/dib/fx_dib_transform.cpp
+++ b/core/src/fxge/dib/fx_dib_transform.cpp
@@ -73,7 +73,6 @@ CFX_DIBitmap* CFX_DIBSource::SwapXY(FX_BOOL bXFlip, FX_BOOL bYFlip, const FX_REC
         return NULL;
     }
     pTransBitmap->CopyPalette(m_pPalette);
-    int src_pitch = m_Pitch;
     int dest_pitch = pTransBitmap->GetPitch();
     FX_LPBYTE dest_buf = pTransBitmap->GetBuffer();
     int row_start = bXFlip ? m_Height - dest_clip.right : dest_clip.left;
@@ -133,7 +132,6 @@ CFX_DIBitmap* CFX_DIBSource::SwapXY(FX_BOOL bXFlip, FX_BOOL bYFlip, const FX_REC
         }
     }
     if (m_pAlphaMask) {
-        src_pitch = m_pAlphaMask->m_Pitch;
         dest_pitch = pTransBitmap->m_pAlphaMask->GetPitch();
         dest_buf = pTransBitmap->m_pAlphaMask->GetBuffer();
         int dest_step = bYFlip ? -dest_pitch : dest_pitch;