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str2fmt: don't crash when string isn't set

--- a/misc.c

+++ b/misc.c

@@ -19,7 +19,7 @@

 {

 	int i;

-	for(i = 0; i < nelem(fmts) && strcmp(fmts[i], s) != 0; i++);

+	for(i = 0; i < nelem(fmts) && fmts[i] != nil && strcmp(fmts[i], s) != 0; i++);

 	return i < nelem(fmts) ? i : -1;

 }