psram: Use 8-bit type for _ext_ram_bss_start/_ext_ram_bss_end

Fixes pointer arithmetic when printing size of remaining heap

diff --git a/components/esp32/spiram.c b/components/esp32/spiram.c
index ecd95dcdb13f5999b5c47d137f9ad6e0e9665676..e2dcfd4cc56eafd04c13df318c9455fa29d19b70 100644 (file)
--- a/components/esp32/spiram.c
+++ b/components/esp32/spiram.c
@@ -61,7 +61,7 @@ static const char* TAG = "spiram";
 #endif
 
 #if CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
-extern int _ext_ram_bss_start, _ext_ram_bss_end;
+extern uint8_t _ext_ram_bss_start, _ext_ram_bss_end;
 #endif
 static bool spiram_inited=false;