Errata \`a ``Sur les repr\'esentations non ramifi\'ees des groupes   r\'eductifs $p$-adiques; l'exemple de ${\rm GSp}(4)$''
  We correct two errors in the paper "Sur les repr\'esentations non ramifi\'ees des groupes r\'eductifs p-adiques; l'exemple de GSp(4)": the first in the study of an involution on the irreducible unramified representations of a semi-simple group, the second in the description of representations of the group GSp(4). 
Fran\c{c}ois Rodier