common.xml: change ESC_INFO to allow negative temperatures. (mavlink#…

…1663)

Signed-off-by: Claudio Micheli <claudio@auterion.com>

message_definitions/v1.0/common.xml

@@ -6377,7 +6377,7 @@
       <field type="uint8_t" name="info" display="bitmask">Information regarding online/offline status of each ESC.</field>
       <field type="uint16_t[4]" name="failure_flags" enum="ESC_FAILURE_FLAGS" display="bitmask">Bitmap of ESC failure flags.</field>
       <field type="uint32_t[4]" name="error_count">Number of reported errors by each ESC since boot.</field>
-      <field type="uint8_t[4]" name="temperature" units="degC">Temperature measured by each ESC. UINT8_MAX if data not supplied by ESC.</field>
+      <field type="int16_t[4]" name="temperature" units="cdegC" invalid="INT16_MAX">Temperature of each ESC. INT16_MAX: if data not supplied by ESC.</field>
     </message>
     <message id="291" name="ESC_STATUS">
       <wip/>