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remove unnecessary variable in qstring

--- a/tran.c

+++ b/tran.c

@@ -563,7 +563,6 @@

 char *qstring(const char *is, int delim)	/* collect string up to next delim */

 {

-	const char *os = is;

 	int c, n;

 	const uschar *s = (const uschar *) is;

 	uschar *buf, *bp;

@@ -572,7 +571,7 @@

 		FATAL( "out of space in qstring(%s)", s);

 	for (bp = buf; (c = *s) != delim; s++) {

 		if (c == '\n')

-			SYNTAX( "newline in string %.20s...", os );

+			SYNTAX( "newline in string %.20s...", is );

 		else if (c != '\\')

 			*bp++ = c;

 		else {	/* \something */

-- 

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