vhook/ppm.c:134: error: Null Dereference
  pointer `in` last assigned on line 130 could be null and is dereferenced by call to `fgetc()` at line 134, column 13.

vhook/ppm.c:126:1: start of procedure rwpipe_read_number()
124. */
125. 
126. static int rwpipe_read_number( rwpipe *rw )
     ^
127. {
128.     int value = 0;

vhook/ppm.c:128:5: 
126. static int rwpipe_read_number( rwpipe *rw )
127. {
128.     int value = 0;
         ^
129.     int c = 0;
130.     FILE *in = rwpipe_reader( rw );

vhook/ppm.c:129:5: 
127. {
128.     int value = 0;
129.     int c = 0;
         ^
130.     FILE *in = rwpipe_reader( rw );
131. 

vhook/ppm.c:130:5: 
128.     int value = 0;
129.     int c = 0;
130.     FILE *in = rwpipe_reader( rw );
         ^
131. 
132.     do

vhook/ppm.c:104:1: start of procedure rwpipe_reader()
  102. */
  103. 
  104. static FILE *rwpipe_reader( rwpipe *this )
       ^
  105. {
  106.     if ( this != NULL )

vhook/ppm.c:106:10: Taking false branch
  104. static FILE *rwpipe_reader( rwpipe *this )
  105. {
  106.     if ( this != NULL )
                ^
  107.         return this->reader;
  108.     else

vhook/ppm.c:109:9: 
  107.         return this->reader;
  108.     else
  109.         return NULL;
               ^
  110. }
  111. 

vhook/ppm.c:110:1: return from a call to rwpipe_reader
  108.     else
  109.         return NULL;
  110. }
       ^
  111. 
  112. /** Write data to the pipe.

vhook/ppm.c:134:9: 
132.     do
133.     {
134.         c = fgetc( in );
             ^
135. 
136.         while( c != EOF && !isdigit( c ) && c != '#' )
