stm32/main: Fix bug mounting 3rd SD partition.

dpgeorge · dpgeorge · commit eae495a71479 · 2020-03-12T12:34:31.000+11:00
Fixes issue micropython#5753.
diff --git a/ports/stm32/main.c b/ports/stm32/main.c
@@ -260,7 +260,7 @@ STATIC bool init_sdcard_fs(void) {
                 // subsequent partitions are numbered by their index in the partition table
                 if (part_num == 2) {
                     vfs->str = "/sd2";
-                } else if (part_num == 2) {
+                } else if (part_num == 3) {
                     vfs->str = "/sd3";
                 } else {
                     vfs->str = "/sd4";
