kexec_lock: Replace kexec_mutex() by kexec_lock() in two comments

kexec_mutex is replaced by an atomic variable
in 05c6257433 (panic, kexec: make __crash_kexec() NMI safe).

But there are still two comments that referenced kexec_mutex,
replace them by kexec_lock.

Signed-off-by: Wenyu Liu <liuwenyu7@huawei.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>

kernel/kexec_file.c

@@ -624,7 +624,7 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf)
  * kexec_add_buffer - place a buffer in a kexec segment
  * @kbuf:	Buffer contents and memory parameters.
  *
- * This function assumes that kexec_mutex is held.
+ * This function assumes that kexec_lock is held.
  * On successful return, @kbuf->mem will have the physical address of
  * the buffer in memory.
  *

security/integrity/ima/ima_kexec.c

@@ -77,7 +77,7 @@ out:
  * Called during kexec_file_load so that IMA can add a segment to the kexec
  * image for the measurement list for the next kernel.
  *
- * This function assumes that kexec_mutex is held.
+ * This function assumes that kexec_lock is held.
  */
 void ima_add_kexec_buffer(struct kimage *image)
 {