[PATCH] ash: only catch unexpected exceptions in PS1 expansion

[Ron Yorston]

Bastian Bittorf wrote:
>Maybe i am a "victim" of this patch:

1.30.0 has the faulty commit d1a2fa2a4 (ash: catch error in arithmetic
expansion in PS1) but not the subsequent correction in commit 943e81f5d
(ash: only catch unexpected exceptions in PS1 expansion).

Commit 943e81f5d should be backported to the stable branch.  It applies
as-is.

Ron