whisper : revert accidental MB change

ggml.c

@@ -311,7 +311,6 @@ int64_t ggml_cycles_per_ms(void) {
     return CLOCKS_PER_SEC/1000;
 }
 
-//#define GGML_PERF
 #ifdef GGML_PERF
 #define ggml_perf_time_ms()       ggml_time_ms()
 #define ggml_perf_time_us()       ggml_time_us()

whisper.cpp

@@ -131,7 +131,7 @@ static const std::map<std::string, std::pair<int, std::string>> g_lang = {
     { "su",  { 98,  "sundanese",      } },
 };
 
-static const size_t MB = 3*1024*1024;
+static const size_t MB = 1024*1024;
 
 static const std::map<e_model, size_t> MEM_REQ_MODEL = {
     { MODEL_TINY,     74ull*MB },