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strtomp: update the returned char* even if there were no characters parsed

--- a/sys/src/libmp/port/strtomp.c

+++ b/sys/src/libmp/port/strtomp.c

@@ -240,12 +240,12 @@

 		return nil;

 	}

+	if(pp != nil)

+		*pp = e;

+

 	// if no characters parsed, there wasn't a number to convert

 	if(e == a)

 		return nil;

-

-	if(pp != nil)

-		*pp = e;

 	b->sign = sign;

 	return mpnorm(b);

-- 

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