6068 libdisasm: previnstr arch op should have a sane default
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Dan McDonald <danmcd@omniti.com>
6067 libdisasm: use C99 designated initializers for arch ops
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Dan McDonald <danmcd@omniti.com>

*** 195,209 ****
  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)
--- 195,204 ----
*** 346,359 ****
  
          return (0);
  }
  
  const dis_arch_t dis_arch_sparc = {
!         dis_sparc_supports_flags,
!         dis_sparc_handle_attach,
!         dis_sparc_handle_detach,
!         dis_sparc_disassemble,
!         dis_sparc_previnstr,
!         dis_sparc_min_instrlen,
!         dis_sparc_max_instrlen,
!         dis_sparc_instrlen
  };
--- 341,354 ----
  
          return (0);
  }
  
  const dis_arch_t dis_arch_sparc = {
!         .da_supports_flags      = dis_sparc_supports_flags,
!         .da_handle_attach       = dis_sparc_handle_attach,
!         .da_handle_detach       = dis_sparc_handle_detach,
!         .da_disassemble         = dis_sparc_disassemble,
!         .da_previnstr           = dis_sparc_previnstr,
!         .da_min_instrlen        = dis_sparc_min_instrlen,
!         .da_max_instrlen        = dis_sparc_max_instrlen,
!         .da_instrlen            = dis_sparc_instrlen
  };