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>

hw/xfree86/common/xf86AutoConfig.c

@@ -120,8 +120,7 @@ FreeList(const char ***list, int *lines)
     int i;
 
     for (i = 0; i < *lines; i++) {
-	if ((*list)[i])
-	    free((*list)[i]);
+	free((*list)[i]);
     }
     free(*list);
     *list = NULL;