Add support for '-h' (help).

https://github.com/PaulStoffregen/teensy_loader_cli/pull/26

---
 teensy_loader_cli.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/teensy_loader_cli.c b/teensy_loader_cli.c
index d4a6cc5..0a06209 100644
--- a/teensy_loader_cli.c
+++ b/teensy_loader_cli.c
@@ -37,7 +37,8 @@ void usage(const char *err)
 {
 	if(err != NULL) fprintf(stderr, "%s\n\n", err);
 	fprintf(stderr,
-		"Usage: teensy_loader_cli --mcu=<MCU> [-w] [-h] [-n] [-b] [-v] <file.hex>\n"
+		"Usage: teensy_loader_cli --mcu=<MCU> [-h] [-w] [-n] [-b] [-v] <file.hex>\n"
+		"\t-h : Print this help message\n"
 		"\t-w : Wait for device to appear\n"
 		"\t-r : Use hard reboot if device not online\n"
 		"\t-s : Use soft reboot if device not online (Teensy3.x only)\n"
@@ -1081,6 +1082,7 @@ void parse_flag(char *arg)
 	int i;
 	for(i=1; arg[i]; i++) {
 		switch(arg[i]) {
+			case 'h': usage(NULL); break;
 			case 'w': wait_for_device_to_appear = 1; break;
 			case 'r': hard_reboot_device = 1; break;
 			case 's': soft_reboot_device = 1; break;
-- 
2.7.4

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<div class='path'>path: <a href='/guix/log/?id=adb1e3b6cfdd342d1ca95a7901a94543b2585f81'>root</a>/<a href='/guix/log/etc?id=adb1e3b6cfdd342d1ca95a7901a94543b2585f81'>etc</a>/<a href='/guix/log/etc/git?id=adb1e3b6cfdd342d1ca95a7901a94543b2585f81'>git</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/git?id=adb1e3b6cfdd342d1ca95a7901a94543b2585f81&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-02-08 03:42:08 +0100'>2017-02-08</span></td><td><a href='/guix/commit/etc/git?id=f0d0c5bb188455e0b82ee3089ba103ef71877c87'>etc: The pre-push hook says which commits failed the signature check.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2017-01-04 16:27:20 -0500'>2017-01-04</span></td><td><a href='/guix/commit/etc/git?id=69355e1283d300a663fb639ec426f10f3feb404b'>doc: Add a Git hook that verifies signatures before pushing.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>