[pcf] Zero out the allocated properties.

Fallout reported as
  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=40033

* src/pcf/pcfread.c (pcf_get_properties): Use FT_NEW_ARRAY and zero
out `properties` in case of failure.

src/pcf/pcfread.c

@@ -613,7 +613,8 @@ THE SOFTWARE.
 
     strings[string_size] = '\0';
 
-    if ( FT_QNEW_ARRAY( properties, nprops ) )
+    /* zero out in case of failure */
+    if ( FT_NEW_ARRAY( properties, nprops ) )
       goto Bail;
 
     face->properties = properties;