[Rd] %s in filename when opening device causes crash (PR#10571)

[richard.cotton at hsl.gov.uk]

Full_Name: Richard Cotton
Version: 2.6.1
OS: Windows XP (32bit)
Submission from: (NULL) (193.119.236.82)


Using %s in a filename when opening a device causes R to crash, e.g.,

pdf("foo%s.pdf")
win.metafile("foo%s.wmf")
postscript("foo%s.ps")