Fix mem profile

BUILD.md

@@ -37,7 +37,8 @@ make release
 >
 > ```sh
 > TAGS=pprof make clean install
-> fzf --profile-cpu /tmp/cpu.pprof
+> fzf --profile-cpu /tmp/cpu.pprof --profile-mem /tmp/mem.pprof \
+>     --profile-block /tmp/block.pprof --profile-mutex /tmp/mutex.pprof
 > ```
 
 Third-party libraries used

src/options_pprof.go

@@ -47,7 +47,7 @@ func (o *Options) initProfiling() error {
 		}
 		util.AtExit(func() {
 			runtime.GC()
-			util.AtExit(func() { stopProfile("allocs", f) })
+			stopProfile("allocs", f)
 		})
 	}