Remove more superfluous if(p) checks around free(p)

This patch has been generated by the following Coccinelle semantic patch:

@@
expression E;
@@

-if(E) { free(E); }
+free(E);

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Reviewed-by: Julien Cristau <jcristau@debian.org>
Reviewed-by: Fernando Carrijo <fcarrijo@yahoo.com.br>
Reviewed-by: Matt Turner <mattst88@gmail.com>

mi/mifillrct.c

@@ -111,8 +111,8 @@ miPolyFillRect(
     pwFirst = malloc(maxheight * sizeof(int));
     if(!pptFirst || !pwFirst)
     {
-	if (pwFirst) free(pwFirst);
-	if (pptFirst) free(pptFirst);
+	free(pwFirst);
+	free(pptFirst);
 	return;
     }