help.c: wrap wait-only poll() invocation in sleep_millisec()

We want to use the new function elsewhere in a moment.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Reviewed-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -1680,5 +1680,6 @@ int stat_validity_check(struct stat_validity *sv, const char *path);
 void stat_validity_update(struct stat_validity *sv, int fd);
 
 int versioncmp(const char *s1, const char *s2);
+void sleep_millisec(int millisec);
 
 #endif /* CACHE_H */

help.c

@@ -372,7 +372,7 @@ const char *help_unknown_cmd(const char *cmd)
 		if (autocorrect > 0) {
 			fprintf_ln(stderr, _("in %0.1f seconds automatically..."),
 				(float)autocorrect/10.0);
-			poll(NULL, 0, autocorrect * 100);
+			sleep_millisec(autocorrect * 100);
 		}
 		return assumed;
 	}

wrapper.c

@@ -595,3 +595,8 @@ int write_file(const char *path, int fatal, const char *fmt, ...)
 	}
 	return 0;
 }
+
+void sleep_millisec(int millisec)
+{
+	poll(NULL, 0, millisec);
+}