remove hasprefix(), use startswith()

src/shared/logs-show.c

@@ -536,7 +536,7 @@ static int output_export(
                 /* We already printed the boot id, from the data in
                  * the header, hence let's suppress it here */
                 if (length >= 9 &&
-                    hasprefix(data, "_BOOT_ID="))
+                    startswith(data, "_BOOT_ID="))
                         continue;
 
                 if (!utf8_is_printable(data, length)) {

src/shared/macro.h

@@ -186,8 +186,6 @@ static inline size_t ALIGN_TO(size_t l, size_t ali) {
 
 #define char_array_0(x) x[sizeof(x)-1] = 0;
 
-#define hasprefix(s, prefix) (memcmp(s, prefix, strlen(prefix)) == 0)
-
 #define IOVEC_SET_STRING(i, s)                  \
         do {                                    \
                 struct iovec *_i = &(i);        \