Avoid confusing "read prevented write" log messages.

Moving to a "function: message" style avoids ambiguity.

Change-Id: If9d590e50265c61725d3673bd03796e65edd2d5e
diff --git a/libc/bionic/__umask_chk.cpp b/libc/bionic/__umask_chk.cpp
index 7d2a99a..33b7121 100644
--- a/libc/bionic/__umask_chk.cpp
+++ b/libc/bionic/__umask_chk.cpp
@@ -43,9 +43,9 @@
  * greater than 0.
  */
 extern "C" mode_t __umask_chk(mode_t mode) {
-    if (__predict_false((mode & 0777) != mode)) {
-        __fortify_chk_fail("umask called with invalid mask", 0);
-    }
+  if (__predict_false((mode & 0777) != mode)) {
+    __fortify_chk_fail("umask: called with invalid mask", 0);
+  }
 
-    return umask(mode);
+  return umask(mode);
 }