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webfs: capture error string from tlsClient

--- a/sys/src/cmd/webfs/http.c

+++ b/sys/src/cmd/webfs/http.c

@@ -89,10 +89,13 @@

 	if((fd = dial(addr, 0, 0, &ctl)) < 0)

 		return nil;

 	if(strcmp(u->scheme, "https") == 0){

+		char err[ERRMAX];

 		TLSconn *tc;

 		tc = emalloc(sizeof(*tc));

-		fd = tlsClient(ofd = fd, tc);

+		strcpy(err, "tls error");

+		if((fd = tlsClient(ofd = fd, tc)) < 0)

+			errstr(err, sizeof(err));

 		close(ofd);

 		/* BUG: should validate but how? */

 		free(tc->cert);

@@ -100,6 +103,8 @@

 		free(tc);

 		if(fd < 0){

 			close(ctl);

+			if(debug) fprint(2, "tlsClient: %s\n", err);

+			errstr(err, sizeof(err));

 			return nil;

 		}

 	}

-- 

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