Description: block: Fix iterating over an empty bio with bio_for_each_folio_all
References:
Notes:
 carnil> Introduced in 640d1930bef4 ("block: Add bio_for_each_folio_all()"). Vulnerable
 carnil> versions: 5.17-rc1.
Bugs:
upstream: released (6.8-rc1) [7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7]
6.7-upstream-stable: released (6.7.2) [ca3ede3f5893e2d26d4dbdef1eec28a8487fafde]
6.6-upstream-stable: released (6.6.14) [a6bd8182137a12d22d3f2cee463271bdcb491659]
6.1-upstream-stable: released (6.1.75) [c6350b5cb78e9024c49eaee6fdb914ad2903a5fe]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.6.15-1)
6.1-bookworm-security: released (6.1.76-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"