tools: usbip: detach: avoid calling strlen() at each iteration

Instead of calling strlen on every iteration of the for loop, just call it
once and cache the result in a temporary local variable which will be used
in the for loop instead.

Signed-off-by: Eric Curtin <ericcurtin17@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/tools/usb/usbip/src/usbip_detach.c b/tools/usb/usbip/src/usbip_detach.c
index 05c6d15856eb..9db9d21bb2ec 100644
--- a/tools/usb/usbip/src/usbip_detach.c
+++ b/tools/usb/usbip/src/usbip_detach.c
@@ -47,7 +47,9 @@ static int detach_port(char *port)
         uint8_t portnum;
         char path[PATH_MAX+1];
 
-        for (unsigned int i = 0; i < strlen(port); i++)
+        unsigned int port_len = strlen(port);
+
+        for (unsigned int i = 0; i < port_len; i++)
                 if (!isdigit(port[i])) {
                         err("invalid port %s", port);
                         return -1;