Fix string comparisons

src/main.c

@@ -51,9 +51,9 @@ void * rss_loop(void * __dummy) {
 double compression_to_epsilon(const char * compression) {
   if(strncmp(compression, "medium", 6) == 0) {
     return 1e-6;
-  } else if(strncmp(compression, "low", 4) == 0) {
+  } else if(strncmp(compression, "low", 3) == 0) {
     return 1e-10;
-  } else if(strncmp(compression, "disabled", 6) == 0) {
+  } else if(strncmp(compression, "disabled", 8) == 0) {
     return 1e-16;
   }