cmd/exception: missing include string.h

When building qemu_arm64_defconfig with CMD_EXCEPTION a build error occurs:

    In file included from cmd/arm/exception64.c:87:
    include/exception.h: In function ‘exception_complete’:
    include/exception.h:41:23: error: implicit declaration of
    function ‘strlen’ [-Wimplicit-function-declaration]
       41 |                 len = strlen(argv[1]);
          |                       ^~~~~~

Add the missing include.

Signed-off-by: Heinrich Schuchardt <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Tom Rini <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/exception.h b/include/exception.h
index a7f21e73d75..0d4dff49954 100644
--- a/include/exception.h
+++ b/include/exception.h
@@ -6,6 +6,7 @@
  */
 
 #include <command.h>
+#include <string.h>
 
 static int do_exception(struct cmd_tbl *cmdtp, int flag, int argc,
 			char *const argv[])