Have gr_init_font alloc memory for the font

Change-Id: I8ccf369d52011bc5d07d8e041fe558ce734a78fc
diff --git a/minui/minui.h b/minui/minui.h
index 23156b6..d30426d 100644
--- a/minui/minui.h
+++ b/minui/minui.h
@@ -55,7 +55,7 @@
 void gr_texticon(int x, int y, GRSurface* icon);
 
 const GRFont* gr_sys_font();
-int gr_init_font(const char* name, GRFont* dest);
+int gr_init_font(const char* name, GRFont** dest);
 void gr_text(const GRFont* font, int x, int y, const char *s, bool bold);
 int gr_measure(const GRFont* font, const char *s);
 void gr_font_size(const GRFont* font, int *x, int *y);