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libc: remove non-C99 strnlen usage in vfprintf

--- a/src/libc/stdio/vfprintf.c

+++ b/src/libc/stdio/vfprintf.c

@@ -350,7 +350,8 @@

 				goto wstrout;

 			} else {

 				s = va_arg(va2, char *);

-				len = strnlen(s, conv.prec);

+				if ((len = strlen(s)) > conv.prec)

+					len = conv.prec;

 				goto strout;

 			}

 		wstrout: