tree: Drop unnecessary "true/false" comments

Change-Id: I5cd04972936c14d92295915fad65c7a45a8108d9
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84152
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <czapiga@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/security/vboot/misc.h

@@ -22,9 +22,6 @@ static inline int vboot_is_firmware_slot_a(struct vb2_context *ctx)
 
 /*
  * Check if given flag is set in the flags field in GBB header.
- * Return value:
- * true: Flag is set.
- * false: Flag is not set.
  */
 static inline bool vboot_is_gbb_flag_set(enum vb2_gbb_flag flag)
 {