Use singular they to refer to "the user" in comments

Change-Id: I726006fe2c1780361bdf6f9a1ddd84da0733642d
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/52472
Original-Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/71346
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/dmi.c b/dmi.c
index 7488d61..561ccc7 100644
--- a/dmi.c
+++ b/dmi.c
@@ -182,7 +182,7 @@
 		 *   is invalid, but we cannot reliably locate the next entry.
 		 * - If the length value indicates that this structure spreads
 		 *   across the table border, something is fishy too.
-		 * Better stop at this point, and let the user know his/her
+		 * Better stop at this point, and let the user know their
 		 * table is broken.
 		 */
 		if (data[1] < 4 || data + data[1] >= limit) {
diff --git a/libflashrom.c b/libflashrom.c
index 1f8aa00..53deb6f 100644
--- a/libflashrom.c
+++ b/libflashrom.c
@@ -66,7 +66,7 @@
 }
 
 /* TODO: flashrom_set_loglevel()? do we need it?
-         For now, let the user decide in his callback. */
+         For now, let the user decide in their callback. */
 
 /**
  * @brief Set the log callback function.