ext4: fix a style issue in fs/ext4/acl.c

Fixed an if statement where braces were not needed.

Link: https://lore.kernel.org/r/20200416141456.1089-1-carlosteniswarrior@gmail.com


Signed-off-by: Carlos Guerrero Álvarez <carlosteniswarrior@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Ritesh Harjani <riteshh@linux.ibm.com>