minor: fix typo in comment

Change-Id: I3edb50abe93bc8574c9c1f25b34f75dab2e8f0ce
diff --git a/firmware/apps/cardem/main.c b/firmware/apps/cardem/main.c
index 0b5fbde..ef24c36 100644
--- a/firmware/apps/cardem/main.c
+++ b/firmware/apps/cardem/main.c
@@ -129,9 +129,8 @@
 		return;
 
 	ch = UART_GetChar();
-	/* We must echo the character to make python fdexpect happy, whcih we use in factory testing */
+	/* We must echo the character to make python fdexpect happy, which we use in factory testing */
 	fputc(ch, stdout);
-
 	board_exec_dbg_cmd(ch);
 }