Fixed leak and clean up formatting.

src/osgPlugins/tga/ReaderWriterTGA.cpp

@@ -405,6 +405,7 @@ int *numComponents_ret)
                         break;
                     default:
                         tgaerror = ERR_UNSUPPORTED;
+                        delete [] formattedMap;
                         return NULL; /* unreachable code - (depth < 1 || depth > 4) rejected by "check for reasonable values in case this is not a tga file" near the start of this function*/
                     }
 
@@ -415,8 +416,7 @@ int *numComponents_ret)
                 dest += lineoffset;
             }
 
-            if (formattedMap)
-                delete[] formattedMap;
+            delete [] formattedMap;
         }
         break;
         case 2:                  /* RGB, uncompressed */