* spawn.cc (find_exec): Initialize err (CID 60111).

* strace.cc (strace::activate): Fix potential buffer overrun (CID 59938)
	* syscalls.cc (popen): Close parent pipe descriptor via fclosing fp on
	error to avoid resource leak (CID 59981).
	* thread.cc (pthread::exit): Avoid accessing cygtls member after
	deleting "this" (CID 60217).

winsup/cygwin/syscalls.cc

@@ -4355,8 +4355,17 @@ popen (const char *command, const char *in_type)
   /* If we reach here we've seen an error but the pipe handles are open.
      Close them and return NULL. */
   int save_errno = get_errno ();
-  close (fds[0]);
-  close (fds[1]);
+  if (fp)
+    {
+      /* Must fclose fp to avoid memory leak. */
+      fclose (fp);
+      close (fds[myix ^ 1]);
+    }
+  else
+    {
+      close (fds[0]);
+      close (fds[1]);
+    }
   set_errno (save_errno);
 
 #undef rw