Remove an unnecessary memset().

FossilOrigin-Name: e7b7f5884a78630c6ba6a217c36247397e62f1928d4b480df929efcfc4a01893

manifest

@@ -1,5 +1,5 @@
-C Make\sthe\swalIndexPage()\sroutine\sabout\s3x\sfaster\sby\sfactoring\sout\sthe\sseldom\nused\sreallocation\slogic\sinto\sa\sseparate\ssubroutine.
-D 2018-02-20T22:20:57.397
+C Remove\san\sunnecessary\smemset().
+D 2018-02-21T00:48:02.760
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in a2d2fb8d17c39ab5ec52beb27850b903949080848236923f436156b72a958737
@@ -472,7 +472,7 @@ F src/os.c 22d31db3ca5a96a408fbf1ceeaaebcaf64c87024d2ff9fe1cf2ddbec3e75c104
 F src/os.h 48388821692e87da174ea198bf96b1b2d9d83be5dfc908f673ee21fafbe0d432
 F src/os_common.h b2f4707a603e36811d9b1a13278bffd757857b85
 F src/os_setup.h 0dbaea40a7d36bf311613d31342e0b99e2536586
-F src/os_unix.c 9e02186f0dcde77d3ec27d4409664eb692c4e8ea0257e30c0b7f25969fa69fec
+F src/os_unix.c 928586cbde31890538854f1657463392d63b2d7794f577774573ae53ec283d7b
 F src/os_win.c eb03c6d52f893bcd7fdd4c6006674c13c1b5e49543fec98d605201af2997171c
 F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
 F src/pager.c 0b6bd5442733b2e08d0673de6cdafe3e7ab0b5715e4844ac836ab346b1d9ed89
@@ -1707,7 +1707,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P cd81613850c0458b4b5b2460b9b38ce7ff6e557f7add9615058bb96f5a344ccd
-R 1787f3579805a4f44923446da8d3d679
+P e2b107141cd97bd4ab240748a9ce43fc2ec950ea74610697a4a7a3d7a6441e6b
+R 59bb924e6fde113e9c73dbca193c7d8f
 U drh
-Z 192c58e6de32e2b3cf41a7ef956f2494
+Z 888a0e04ef92ada18bb625445f9ec36e

manifest.uuid

@@ -1 +1 @@
-e2b107141cd97bd4ab240748a9ce43fc2ec950ea74610697a4a7a3d7a6441e6b
+e7b7f5884a78630c6ba6a217c36247397e62f1928d4b480df929efcfc4a01893

src/os_unix.c

@@ -4180,12 +4180,10 @@ static int unixShmSystemLock(
 
   if( pShmNode->h>=0 ){
     /* Initialize the locking parameters */
-    memset(&f, 0, sizeof(f));
     f.l_type = lockType;
     f.l_whence = SEEK_SET;
     f.l_start = ofst;
     f.l_len = n;
-
     rc = osFcntl(pShmNode->h, F_SETLK, &f);
     rc = (rc!=(-1)) ? SQLITE_OK : SQLITE_BUSY;
   }