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git: avoid uninterruptible temporary warning

dont' fall into the rathole.

--- a/sys/src/cmd/git/pack.c

+++ b/sys/src/cmd/git/pack.c

@@ -1000,7 +1000,8 @@

 	retried = 0;

 retry:

 	for(i = 0; i < npackf; i++){

-		if((o = searchindex(packf[i].idx, packf[i].nidx, h)) != -1){

+		o = searchindex(packf[i].idx, packf[i].nidx, h);

+		if(o != -1){

 			if((f = openpack(&packf[i])) == nil)

 				goto error;

 			if((r = Bseek(f, o, 0)) != -1)

--- a/sys/src/cmd/git/save.c

+++ b/sys/src/cmd/git/save.c

@@ -351,7 +351,6 @@

 	Object *t;

 	gitinit();

-	gitinit();

 	if(access(".git", AEXIST) != 0)

 		sysfatal("could not find git repo: %r");

 	if(getwd(cwd, sizeof(cwd)) == nil)

--- a/sys/src/cmd/git/util.c

+++ b/sys/src/cmd/git/util.c

@@ -67,7 +67,8 @@

 	uvlong na;

 	void *v;

-	if((na = (uvlong)n*(uvlong)sz) >= (1ULL<<30))

+	na = (uvlong)n*(uvlong)sz;

+	if(na >= (1ULL<<30))

 		sysfatal("alloc: overflow");

 	v = mallocz(na, 1);

 	if(v == nil)

@@ -94,7 +95,8 @@

 	uvlong na;

 	void *v;

-	if((na = (uvlong)n*(uvlong)sz) >= (1ULL<<30))

+	na = (uvlong)n*(uvlong)sz;

+	if(na >= (1ULL<<30))

 		sysfatal("alloc: overflow");

 	v = realloc(p, na);

 	if(v == nil)