crash-causing typo in vips_rawsave()

thanks Alessandro

ChangeLog

@@ -2,6 +2,7 @@
 - grey ramp minimum was wrong
 - vipsthumbnail --crop could fail for very non-square images, thanks
   Alessandro
+- fix a crash in vips_rawsave(), thanks Alessandro
 
 24/2/14 started 7.38.5
 - jpeg load from buffer could write to input, thanks Lovell

libvips/foreign/rawsave.c

@@ -174,7 +174,7 @@ vips_rawsave( VipsImage *in, const char *filename, ... )
 	int result;
 
 	va_start( ap, filename );
-	result = vips_call_split( "rawsave", ap, filename );
+	result = vips_call_split( "rawsave", ap, in, filename );
 	va_end( ap );
 
 	return( result );