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mothra: don't use isdigit()

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

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

@@ -3,7 +3,6 @@

  */

 #include <u.h>

 #include <libc.h>

-#include <ctype.h>

 #include <draw.h>

 #include <event.h>

 #include <keyboard.h>

@@ -542,7 +541,7 @@

 		break;

 	case 'j':

 		s=arg(s);

-		if(isdigit(s))

+		if(*s)

 			geturl(www(atoi(s)-1)->url->fullname, GET, 0, 0, 0);

 		else

 			message("no url selected");