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fplot: parse negative numbers in argument to -r option (thanks qu7uux)

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

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

@@ -466,16 +466,16 @@

 void

 parserange(char *s)

 {

-	while(*s && !isdigit(*s)) s++;

+	while(*s && !isdigit(*s) && *s != '-') s++;

 	if(*s == 0) return;

 	xmin = strtod(s, &s);

-	while(*s && !isdigit(*s)) s++;

+	while(*s && !isdigit(*s) && *s != '-') s++;

 	if(*s == 0) return;

 	xmax = strtod(s, &s);

-	while(*s && !isdigit(*s)) s++;

+	while(*s && !isdigit(*s) && *s != '-') s++;

 	if(*s == 0) return;

 	ymin = strtod(s, &s);

-	while(*s && !isdigit(*s)) s++;

+	while(*s && !isdigit(*s) && *s != '-') s++;

 	if(*s == 0) return;

 	ymax = strtod(s, &s);

 }