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sam: fix incorrect exit status from shell subproc

--- a/sys/src/cmd/sam/shell.c

+++ b/sys/src/cmd/sam/shell.c

@@ -46,7 +46,6 @@

 	long l;

 	int m;

 	int pid, fd;

-	int retcode;

 	char *retmsg;

 	int pipe1[2], pipe2[2];

@@ -96,20 +95,21 @@

 				 */

 				close(pipe2[0]);

 				io = pipe2[1];

-				if(retcode=!setjmp(mainloop)){	/* assignment = */

-					char *c;

-					for(l = 0; l<plan9buf.nc; l+=m){

-						m = plan9buf.nc-l;

-						if(m>BLOCKSIZE-1)

-							m = BLOCKSIZE-1;

-						bufread(&plan9buf, l, genbuf, m);

-						genbuf[m] = 0;

-						c = Strtoc(tmprstr(genbuf, m+1));

-						Write(pipe2[1], c, strlen(c));

-						free(c);

-					}

+				if(setjmp(mainloop))

+					exits("error");

+

+				char *c;

+				for(l = 0; l<plan9buf.nc; l+=m){

+					m = plan9buf.nc-l;

+					if(m>BLOCKSIZE-1)

+						m = BLOCKSIZE-1;

+					bufread(&plan9buf, l, genbuf, m);

+					genbuf[m] = 0;

+					c = Strtoc(tmprstr(genbuf, m+1));

+					Write(pipe2[1], c, strlen(c));

+					free(c);

 				}

-				exits(retcode? "error" : 0);

+				exits(nil);

 			}

 			if(pid==-1){

 				fprint(2, "Can't fork?!\n");

-- 

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