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Fix memory leak when rejecting bogus DH parameters.

While back-patchinge0e569e, I noted that there were some otherplaces where we ought to be applying DH_free(); namely, where weload some DH parameters from a file and then reject them as notbeing sufficiently secure. While it seems really unlikely thatanybody would hit these code paths in production, let alone doso repeatedly, let's fix it for consistency.Back-patch to v10 where this code was introduced.Discussion:https://postgr.es/m/16160-18367e56e9a28264@postgresql.org

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src/backend/libpq
- be-secure-openssl.c

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`‎src/backend/libpq/be-secure-openssl.c`

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Original file line number	Diff line number	Diff line change
`@@ -899,13 +899,15 @@ load_dh_file(char *filename, bool isServerStart)`
`899`	`899`	`(errcode(ERRCODE_CONFIG_FILE_ERROR),`
`900`	`900`	`errmsg("invalid DH parameters: %s",`
`901`	`901`	`SSLerrmessage(ERR_get_error()))));`
	`902`	`+DH_free(dh);`
`902`	`903`	`returnNULL;`
`903`	`904`	`}`
`904`	`905`	`if (codes&DH_CHECK_P_NOT_PRIME)`
`905`	`906`	`{`
`906`	`907`	`ereport(isServerStart ?FATAL :LOG,`
`907`	`908`	`(errcode(ERRCODE_CONFIG_FILE_ERROR),`
`908`	`909`	`errmsg("invalid DH parameters: p is not prime")));`
	`910`	`+DH_free(dh);`
`909`	`911`	`returnNULL;`
`910`	`912`	`}`
`911`	`913`	`if ((codes&DH_NOT_SUITABLE_GENERATOR)&&`
`@@ -914,6 +916,7 @@ load_dh_file(char *filename, bool isServerStart)`
`914`	`916`	`ereport(isServerStart ?FATAL :LOG,`
`915`	`917`	`(errcode(ERRCODE_CONFIG_FILE_ERROR),`
`916`	`918`	`errmsg("invalid DH parameters: neither suitable generator or safe prime")));`
	`919`	`+DH_free(dh);`
`917`	`920`	`returnNULL;`
`918`	`921`	`}`
`919`	`922`

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Commit4b41f69

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`‎src/backend/libpq/be-secure-openssl.c`

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