libusbgx: Return suitable error codes instead of -1

Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>

diff --git a/src/usbg.c b/src/usbg.c
index cd2179e..4d74a0d 100644 (file)
--- a/src/usbg.c
+++ b/src/usbg.c
@@ -316,18 +316,15 @@ static int usbg_lookup_function_type(const char *name)
        int max = sizeof(function_names)/sizeof(char *);
 
        if (!name)
-               return -1;
+               return USBG_ERROR_INVALID_PARAM;
 
        do {
                if (!strcmp(name, function_names[i]))
-                       break;
+                       return i;
                i++;
        } while (i != max);
 
-       if (i == max)
-               i = -1;
-
-       return i;
+       return USBG_ERROR_NOT_FOUND;
 }
 
 const const char *usbg_get_function_type_str(usbg_function_type type)