Fix a bunch of -Wunused-but-set-variable 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 457fe2e1f102c979f0a19033809549bb4c04c8a8..4544506e7b5ef0f224b6169fd7392c10fcadd1ec 100644
--- a/core/src/fxge/dib/fx_dib_transform.cpp
+++ b/core/src/fxge/dib/fx_dib_transform.cpp
@@ -70,7 +70,6 @@ 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;
@@ -130,7 +129,6 @@ 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;