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>

randr/rrtransform.c

@@ -37,8 +37,7 @@ RRTransformInit (RRTransformPtr transform)
 void
 RRTransformFini (RRTransformPtr transform)
 {
-    if (transform->params)
-	free(transform->params);
+    free(transform->params);
 }
 
 Bool
@@ -82,8 +81,7 @@ RRTransformSetFilter (RRTransformPtr	dst,
     }
     else
 	new_params = NULL;
-    if (dst->params)
-	free(dst->params);
+    free(dst->params);
     dst->filter = filter;
     dst->params = new_params;
     dst->nparams = nparams;