hush: probably fixing a bug in last LINENO fix

I don't have an example of mishandled script, but the logic looked wrong:
it could sometimes treat newlines as if they are spaces.

function                                             old     new   delta
parse_stream                                        2788    2787      -1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/hush.c

@@ -5019,18 +5019,13 @@ static struct pipe *parse_stream(char **pstring,
  * i.e., at the previous line.
  * We need to skip all whitespace before newlines.
  */
-			if (ch != '\n') {
+			while (ch != '\n') {
-				/* It was whitespace, but not a newline.
-				 * Eat all whitespace.
-				 */
-				for (;;) {
 				next = i_peek(input);
 				if (next != ' ' && next != '\t' && next != '\n')
 					break; /* next char is not ws */
 				ch = i_getch(input);
 			}
 			/* ch == last eaten whitespace char */
-			}
 #endif
 			if (done_word(&dest, &ctx)) {
 				goto parse_error;