Fix clang warnings and job comparison bug.

src/api/ApiState.h

@@ -57,7 +57,6 @@ private:
     double m_highestHashrate;
     double m_totalHashrate[3];
     int m_threads;
-    mutable char m_buf[4096];
     NetworkState m_network;
 };
 

src/net/Job.cpp

@@ -171,5 +171,5 @@ void Job::toHex(const unsigned char* in, unsigned int len, char* out)
 
 bool Job::operator==(const Job &other) const
 {
-    return m_id == other.m_id && memcmp(m_blob, other.m_blob, sizeof(m_blob) == 0);
+    return m_id == other.m_id && memcmp(m_blob, other.m_blob, sizeof(m_blob)) == 0;
 }