Fix a clang warning about a dangling else.

BUG=none
R=brucedawson@chromium.org

Review URL: https://codereview.chromium.org/1223433002.
diff --git a/core/src/fxge/win32/fx_win32_gdipext.cpp b/core/src/fxge/win32/fx_win32_gdipext.cpp
index baa5da3..072f408 100644
--- a/core/src/fxge/win32/fx_win32_gdipext.cpp
+++ b/core/src/fxge/win32/fx_win32_gdipext.cpp
@@ -807,12 +807,13 @@
         }
         CallFunc(GdipSetPenDashArray)(pPen, pDashArray, nCount);
         FX_FLOAT phase = pGraphState->m_DashPhase;
-        if (bDashExtend)
+        if (bDashExtend) {
             if (phase < 0.5f) {
                 phase = 0;
             } else {
                 phase -= 0.5f;
             }
+        }
         CallFunc(GdipSetPenDashOffset)(pPen, phase);
         FX_Free(pDashArray);
         pDashArray = NULL;