Make lztest call lzdb from PATH.

Index: zfs+chaos4/cmd/lztest/ztest.c
===================================================================
--- zfs+chaos4.orig/cmd/lztest/ztest.c
+++ zfs+chaos4/cmd/lztest/ztest.c
@@ -3043,30 +3043,17 @@ ztest_verify_blocks(char *pool)
 	char zbuf[1024];
 	char *bin;
 	char *ztest;
-	char *isa;
-	int isalen;
 	FILE *fp;
 
-	(void) realpath(getexecname(), zdb);
-
-	/* zdb lives in /usr/sbin, while ztest lives in /usr/bin */
-	bin = strstr(zdb, "/usr/bin/");
-	ztest = strstr(bin, "/ztest");
-	isa = bin + 8;
-	isalen = ztest - isa;
-	isa = strdup(isa);
 	/* LINTED */
-	(void) sprintf(bin,
-	    "/usr/sbin%.*s/zdb -bc%s%s -U /tmp/zpool.cache -O %s %s",
-	    isalen,
-	    isa,
+	(void) sprintf(zdb,
+	    "lzdb -bc%s%s -U /tmp/zpool.cache -O %s %s",
 	    zopt_verbose >= 3 ? "s" : "",
 	    zopt_verbose >= 4 ? "v" : "",
 	    ztest_random(2) == 0 ? "pre" : "post", pool);
-	free(isa);
 
 	if (zopt_verbose >= 5)
-		(void) printf("Executing %s\n", strstr(zdb, "zdb "));
+		(void) printf("Executing %s\n", strstr(zdb, "lzdb "));
 
 	fp = popen(zdb, "r");