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resample: simplify getint()

--- a/sys/src/cmd/resample.c

+++ b/sys/src/cmd/resample.c

@@ -54,14 +54,13 @@

 int

 getint(char *s, int *percent)

 {

+	int n;

+

 	if(s == nil)

 		usage();

-	*percent = (s[strlen(s)-1] == '%');

-	if(*s == '+')

-		return atoi(s+1);

-	if(*s == '-')

-		return -atoi(s+1);

-	return atoi(s);

+	n = strtol(s, &s, 0);

+	*percent = *s == '%';

+	return n;

 }

 void