pinns: Fixup 'pwarn' output to match 'pwarnf' output
Prior to this change, pwarn and pwarnf had different prefixes. Now they
both prepend '[pinns:w]'
#define pwarnf(fmt, ...) \
do { \
- fprintf(stderr, "[pinns:e]: " fmt ": %s\n", ##__VA_ARGS__, \
+ fprintf(stderr, "[pinns:w]: " fmt ": %s\n", ##__VA_ARGS__, \
strerror(errno)); \
} while (0)
