Don't print meaningless messages about skipping sectors in imageunzip.

clientside/os/imagezip/gpt/gpt_glue.c

 /*
- * Copyright (c) 2000-2014 University of Utah and the Flux Group.
+ * Copyright (c) 2000-2015 University of Utah and the Flux Group.
  * 
  * {{{EMULAB-LICENSE
  * 
@@ -323,14 +323,14 @@ parse_gpt(int fd, struct iz_slice *parttab, iz_lba *startp, iz_size *sizep,
 		if (losect > hdr->hdr_lba_start) {
 			size = losect - hdr->hdr_lba_start;
 			addskip(hdr->hdr_lba_start, size);
-			if (dowarn)
+			if (dowarn > 1)
 				warnx("GPT: Skipping %lu sectors at %lu",
 				      size, hdr->hdr_lba_start);
 		}
 		if (hisect < hdr->hdr_lba_end + 1) {
 			size = hdr->hdr_lba_end + 1 - hisect;
 			addskip(hisect, size);
-			if (dowarn)
+			if (dowarn > 1)
 				warnx("GPT: Skipping %lu sectors at %lu",
 				      size, hisect);
 		}

clientside/os/imagezip/imagezip.c

 /*
- * Copyright (c) 2000-2014 University of Utah and the Flux Group.
+ * Copyright (c) 2000-2015 University of Utah and the Flux Group.
  * 
  * {{{EMULAB-LICENSE
  * 
@@ -960,13 +960,14 @@ read_image(int fd)
 	int		gotbb = 0;
 	iz_lba		dstart;
 	iz_size		dsize;
+	int		dowarn = debug ? 2 : 0;
 
 #ifdef WITH_GPT
-	if (!gotbb && parse_gpt(fd, parttab, &dstart, &dsize, debug) == 0)
+	if (!gotbb && parse_gpt(fd, parttab, &dstart, &dsize, dowarn) == 0)
 		gotbb = 1;
 #endif
 #ifdef WITH_MBR
-	if (!gotbb && parse_mbr(fd, parttab, &dstart, &dsize, debug) == 0)
+	if (!gotbb && parse_mbr(fd, parttab, &dstart, &dsize, dowarn) == 0)
 		gotbb = 2;
 #endif
 

clientside/os/imagezip/mbr/mbr.c

 /*
- * Copyright (c) 2000-2014 University of Utah and the Flux Group.
+ * Copyright (c) 2000-2015 University of Utah and the Flux Group.
  * 
  * {{{EMULAB-LICENSE
  * 
@@ -80,13 +80,13 @@ parse_mbr(int fd, struct iz_slice *parttab, iz_lba *startp, iz_size *sizep,
 		warnx("MBR: lowest partition start > %u! "
 		      "Only saving first %u sectors.",
 		      MAGIC_LOSECT, MAGIC_LOSECT);
-		if (dowarn)
+		if (dowarn > 1)
 			warnx("MBR: skipping %u sectors at %u",
 			      losect - MAGIC_LOSECT, MAGIC_LOSECT);
 	}
 	if (hisect < dsize) {
 		addskip(hisect, dsize-hisect);
-		if (dowarn)
+		if (dowarn > 1)
 			warnx("MBR: skipping %lu sectors at %u",
 			      (unsigned long)(dsize - hisect), hisect);
 	}