pgsql: Cosmetic code cleanup in commands/extension.c.

Cosmetic code cleanup in commands/extension.c.

Some of the comments added by the CREATE EXTENSION CASCADE patch were
a bit sloppy, and I didn't care for redeclaring the same local variable
inside a nested block either. No functional changes.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/25794e841e5b86a0f90fac7f7f851e5d950e51e2

Modified Files
--------------
src/backend/commands/extension.c | 34 +++++++++++++++++-----------------
1 file changed, 17 insertions(+), 17 deletions(-)

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