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[cc2] Give a better message in line without newline

In this case cc2 was printing the message of line too long, which
was wrong, but both cases shared the same test, line without newline.

--- a/cc2/cc2.h

+++ b/cc2/cc2.h

@@ -113,6 +113,7 @@

 	ESTACKO,       /* stack overflow */

 	ESTACKU,       /* stack underflow */

 	ELNLINE,       /* line too long */

+	ELNBLNE,       /* line without new line */

 	EFERROR,       /* error reading from file:%s*/

 	EBADID,        /* incorrect symbol id */

 	ENUMERR

--- a/cc2/parser.c

+++ b/cc2/parser.c

@@ -313,7 +313,7 @@

 	if ((len = strlen(line)) == 0 || line[0] == '\n')

 		goto repeat;

 	if (line[len-1] != '\n')

-		error(ELNLINE);

+		error(len < sizeof(line)-1 ? ELNBLNE : ELNLINE);

 	line[len-1] = '\0';

 	c = *line;