rolling back the experimental rollbacks in r2178-2179

git-svn-id: http://skia.googlecode.com/svn/trunk@2180 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/ports/SkFontHost_linux.cpp b/src/ports/SkFontHost_linux.cpp
index 782b93f..b60db07 100644
--- a/src/ports/SkFontHost_linux.cpp
+++ b/src/ports/SkFontHost_linux.cpp
@@ -129,7 +129,7 @@
         }
         curr = curr->fNext;
     }
-    return false;
+    return NULL;
 }
 
 static bool valid_uniqueID(uint32_t uniqueID) {