sdm: Fix reading of swapinterval property

Fix reading of property debug.egl.swapinterval at display
initialization time.

Change-Id: Ib50fb0baeea09a248e42314eef42899b4177d2d8
diff --git a/sdm/libs/hwc/hwc_display.cpp b/sdm/libs/hwc/hwc_display.cpp
index 09da433..42bf7e3 100644
--- a/sdm/libs/hwc/hwc_display.cpp
+++ b/sdm/libs/hwc/hwc_display.cpp
@@ -76,10 +76,9 @@
   }
 
   int property_swap_interval = 1;
-  if (HWCDebugHandler::Get()->GetProperty("debug.egl.swapinterval", &property_swap_interval)) {
-    if (property_swap_interval == 0) {
-      swap_interval_zero_ = true;
-    }
+  HWCDebugHandler::Get()->GetProperty("debug.egl.swapinterval", &property_swap_interval);
+  if (property_swap_interval == 0) {
+    swap_interval_zero_ = true;
   }
 
   framebuffer_config_ = new DisplayConfigVariableInfo();