kvm_openfiles() uses the supplied buffer for storing error messages

in future calls, so we can't free it here.  The right place to free the
buffer would be to be after kvm_close(), but we don't do that yet.  A
static buffer would work too.

Reviewed by:  marcel (who has other plans for this anyway)
Approved by:  re

gnu/usr.bin/gdb/kgdb/main.c

@@ -409,7 +409,6 @@ main(int argc, char *argv[])
 		kvm = kvm_openfiles(kernel, vmcore, NULL, O_RDONLY, s);
 		if (kvm == NULL)
 			errx(1, s);
-		free(s);
 		kgdb_thr_init();
 	}