fix sk_colorspace include guard

Change-Id: Id6db4fd8147ac96d8fecab3b73d50c5098a070f8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209897
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
diff --git a/include/c/sk_colorspace.h b/include/c/sk_colorspace.h
index f96d9bc..b0659c3 100644
--- a/include/c/sk_colorspace.h
+++ b/include/c/sk_colorspace.h
@@ -8,8 +8,8 @@
 // EXPERIMENTAL EXPERIMENTAL EXPERIMENTAL EXPERIMENTAL
 // DO NOT USE -- FOR INTERNAL TESTING ONLY
 
-#ifndef sk_imageinfo_DEFINED
-#define sk_imageinfo_DEFINED
+#ifndef sk_colorspace_DEFINED
+#define sk_colorspace_DEFINED
 
 #include "sk_types.h"