avoid errors when checking rpm signkeys on files that are not rpm

Author: coolo

osc/checker.py

@@ -87,6 +87,8 @@ def readkey(self, file):
         self.imported[file] = 1
 
     def check(self, pkg):
+        # avoid errors on non rpm
+        if pkg[-4:] != '.rpm': return
         fd = os.open(pkg, os.O_RDONLY)
         hdr = self.ts.hdrFromFdno(fd)
         os.close(fd)