ACPI: utils: Remove redundant braces around individual statement

Remove braces that are not required for a one-line statement which
follows a control statement.

Signed-off-by: Jonathan Bergh <bergh.jonathan@gmail.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/utils.c

@@ -342,9 +342,8 @@ acpi_evaluate_reference(acpi_handle handle,
 	u32 i = 0;
 
 
-	if (!list) {
+	if (!list)
 		return AE_BAD_PARAMETER;
-	}
 
 	/* Evaluate object. */