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>

glx/xfont.c

@@ -97,9 +97,7 @@ static int __glXMakeBitmapFromGlyph(FontPtr font, CharInfoPtr pci)
 				  pci->metrics.characterWidth, 0, 
 				  allocbuf ? allocbuf : buf) );
 
-    if (allocbuf) {
-	free(allocbuf);
-    }
+    free(allocbuf);
     return Success;
 #undef __GL_CHAR_BUF_SIZE
 }