Amends the following compiler warnings:

 ```
 NXpicture.c: In function ‘nxagentReconnectPictFormat’:
 NXpicture.c:2148:9: warning: variable ‘pBool’ set but not used [-Wunused-but-set-variable]
    Bool *pBool;
         ^
 NXpicture.c:2147:17: warning: variable ‘pFormat’ set but not used [-Wunused-but-set-variable]
    PictFormatPtr pFormat;
                  ^
 ```