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mothra: dont panic on invalid regular expression in searchbox

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

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

@@ -699,6 +699,8 @@

 	pldraw(root, screen);

 }

+void regerror(char*){}	/* don't panic */

+

 void search(void){

 	static char last[256];

 	char buf[256];