misc fixes to eliminate compiler warnings

main.cpp

@@ -392,6 +392,7 @@ main(int ac, const char* av[])
                 return xmrblocks.show_checkrawtx(raw_tx_data, action);
             else if (action == "push")
                 return xmrblocks.show_pushrawtx(raw_tx_data, action);
+            return string("Provided action is neither check nor push");
 
         });
     }

src/MempoolStatus.cpp

@@ -58,7 +58,7 @@ MempoolStatus::start_mempool_status_thread()
                      else
                      {
                          cout << "Current network info read, ";
-                         loop_index == 0;
+                         loop_index = 0;
                      }
                  }
 

src/page.h

@@ -3129,7 +3129,7 @@ namespace xmreg
 
             context["data_prefix"] = data_prefix;
 
-            if (!strncmp(decoded_raw_data.c_str(), KEY_IMAGE_EXPORT_FILE_MAGIC, magiclen) == 0)
+            if (strncmp(decoded_raw_data.c_str(), KEY_IMAGE_EXPORT_FILE_MAGIC, magiclen) != 0)
             {
                 string error_msg = fmt::format("This does not seem to be key image export data.");
 
@@ -3274,7 +3274,7 @@ namespace xmreg
 
             context["data_prefix"] = data_prefix;
 
-            if (!strncmp(decoded_raw_data.c_str(), OUTPUT_EXPORT_FILE_MAGIC, magiclen) == 0)
+            if (strncmp(decoded_raw_data.c_str(), OUTPUT_EXPORT_FILE_MAGIC, magiclen) != 0)
             {
                 string error_msg = fmt::format("This does not seem to be output keys export data.");