Fix a variable prototype/definition mismatch.

include/jemalloc/internal/prof.h

@@ -200,7 +200,12 @@ extern bool	opt_prof_gdump;       /* High-water memory dumping. */
 extern bool	opt_prof_final;       /* Final profile dumping. */
 extern bool	opt_prof_leak;        /* Dump leak summary at exit. */
 extern bool	opt_prof_accum;       /* Report cumulative bytes. */
-extern char	opt_prof_prefix[PATH_MAX + 1];
+extern char	opt_prof_prefix[
+    /* Minimize memory bloat for non-prof builds. */
+#ifdef JEMALLOC_PROF
+    PATH_MAX +
+#endif
+    1];
 
 /*
  * Profile dump interval, measured in bytes allocated.  Each arena triggers a

src/prof.c

@@ -29,8 +29,7 @@ char		opt_prof_prefix[
 #ifdef JEMALLOC_PROF
     PATH_MAX +
 #endif
-    1
-];
+    1];
 
 uint64_t	prof_interval = 0;
 bool		prof_promote;