fixed typo

src/rvprof_internal.h

@@ -119,7 +119,7 @@ typedef struct{
     FILE* output_file;
 
     // statistics
-    uint64_t total_program_tiem;
+    uint64_t total_program_time;
     uint64_t total_program_cycles;
     size_t total_memory_allocated;
 } rvprof_context_t;