excelize crash on negative stylng

[liron-l]

Description
formatting.xlsx

Library crash when styling is negative (valid xlsx file attached, opened by any software)

if styleSheet.CellXfs.Xf[s].NumFmtID != nil { <- s is negative
		numFmtID = *styleSheet.CellXfs.Xf[s].NumFmtID
	}

Steps to reproduce the issue:
valid Xslx file attached, can manually create

$ unzip formatting.xlsx
modify xl/worksheets/_rels/sheet1.xml.rels (s="1" -> s="-1")
$ zip -r ../formatting.xlsx *

Describe the results you received:
Library crash

Describe the results you expected:
Library should not crash, should use default formatting

Output of go version:

go version go1.19.2 linux/amd64

Excelize version or commit ID:

2.6.2

Environment details (OS, Microsoft Excel™ version, physical, etc.):
Linux