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always zero initialize Tm structure for tm2sec()

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

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

@@ -439,6 +439,7 @@

 		d = gl16(p);

 	}

+	memset(&tm, 0, sizeof(tm));

 	tm.year = 80 + (d >> 9);

 	tm.mon = ((d >> 5) & 017) - 1;

 	tm.mday = d & 037;

--- a/sys/src/cmd/dossrv/dossubs.c

+++ b/sys/src/cmd/dossrv/dossubs.c

@@ -1750,6 +1750,8 @@

 	int i;

 	i = GSHORT(dp->time);

+

+	memset(&tm, 0, sizeof(tm));

 	tm.hour = i >> 11;

 	tm.min = (i >> 5) & 63;

 	tm.sec = (i & 31) << 1;

--- a/sys/src/cmd/gzip/unzip.c

+++ b/sys/src/cmd/gzip/unzip.c

@@ -764,6 +764,7 @@

 {

 	Tm tm;

+	memset(&tm, 0, sizeof(tm));

 	tm.hour = time >> 11;

 	tm.min = (time >> 5) & 63;

 	tm.sec = (time & 31) << 1;

--- a/sys/src/cmd/ip/cifsd/util.c

+++ b/sys/src/cmd/ip/cifsd/util.c

@@ -101,6 +101,7 @@

 {

 	Tm tm;

+	memset(&tm, 0, sizeof(tm));

 	strcpy(tm.zone, "GMT");

 	tm.mday = date & 0x1f;

 	tm.mon = ((date >> 5) & 0xf) - 1;

--- a/sys/src/cmd/tapefs/zipfs.c

+++ b/sys/src/cmd/tapefs/zipfs.c

@@ -376,6 +376,7 @@

 {

 	Tm tm;

+	memset(&tm, 0, sizeof(tm));

 	tm.hour = time >> 11;

 	tm.min = (time >> 5) & 63;

 	tm.sec = (time & 31) << 1;

--- a/sys/src/cmd/webcookies.c

+++ b/sys/src/cmd/webcookies.c

@@ -636,6 +636,8 @@

 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec",

 	};

+	memset(&tm, 0, sizeof(tm));

+

 	os = s;

 	/* Sunday, */

 	for(i=0; i<nelem(wday); i++){

--- a/sys/src/libhttpd/date.c

+++ b/sys/src/libhttpd/date.c

@@ -113,6 +113,8 @@

 	Tm tm;

 	char buf[32];

+	memset(&tm, 0, sizeof(tm));

+

 	/*

 	 * Weekday|Wday

 	 */