sequential/ammunition: fix loop bound of ammunition_atoi()

bench/sequential/ammunition/ammunition_libc.c

@@ -99,7 +99,7 @@ int ammunition_atoi ( const char *str )
   int readingPos = 0;
   if ( str[ 0 ] == '-' || str[ 0 ] == '+' )
     readingPos++;
-  _Pragma( "loopbound min 1 max 1" )
+  _Pragma( "loopbound min 1 max 7" )
   do {
     result *= 10;
     result += str[ readingPos++ ] - 48;