ima: Fix line continuation format

Line continuations with excess spacing causes unexpected output.

Based on commit 6f76b6fc ("CodingStyle: Document the exception of
not splitting user-visible strings, for grepping") recommendation.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>