be consistent about int for incReserve

Bug: 883666
Change-Id: I4070c958ef9ac5891ea75a8ef349e3d362c97f54
Reviewed-on: https://skia-review.googlesource.com/c/162620
Auto-Submit: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 94ed8cc..af8cf9e 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -757,9 +757,11 @@
         fFirstDirection = SkPathPriv::kUnknown_FirstDirection;  \
     } while (0)
 
-void SkPath::incReserve(U16CPU inc) {
+void SkPath::incReserve(int inc) {
     SkDEBUGCODE(this->validate();)
-    SkPathRef::Editor(&fPathRef, inc, inc);
+    if (inc > 0) {
+        SkPathRef::Editor(&fPathRef, inc, inc);
+    }
     SkDEBUGCODE(this->validate();)
 }