Fix a typo to silence lintian.

--- sofont.c.orig	2011-03-13 22:55:42.000000000 +0100
+++ sofont.c	2011-03-13 22:55:50.000000000 +0100
@@ -291,7 +291,7 @@
 	int     _Spacing[256];
 
 	if (!FontSurface) {
-		fprintf (stderr, "SoFont recieved a NULL SDL_Surface\n");
+		fprintf (stderr, "SoFont received a NULL SDL_Surface\n");
 		return 0;
 	}
 	font->picture = FontSurface;