6068 libdisasm: previnstr arch op should have a sane default
Reviewed by: Robert Mustacchi <rm@joyent.com>

@@ -195,15 +195,10 @@
 dis_sparc_min_instrlen(dis_handle_t *dhp)
 {
         return (4);
 }
 
-/*
- * The dis_i386.c comment for this says it returns the previous instruction,
- * however, I'm fairly sure it's actually returning the _address_ of the
- * nth previous instruction.
- */
 /* ARGSUSED */
 static uint64_t
 dis_sparc_previnstr(dis_handle_t *dhp, uint64_t pc, int n)
 {
         if (n <= 0)