Add helper path_is_absolute()
diff --git a/libkmod/libkmod-util.c b/libkmod/libkmod-util.c
index 58ba1d3..477139f 100644
--- a/libkmod/libkmod-util.c
+++ b/libkmod/libkmod-util.c
@@ -214,3 +214,10 @@
 
 	return s;
 }
+
+bool path_is_absolute(const char *p)
+{
+	assert(p != NULL);
+
+	return p[0] == '/';
+}