Example of a C guideline that backs this up can be found in JPL C coding standard for reliable software-- rule 24 states "There should be no more than one statement or variable declaration per line"

Yes @jphickey
Also in:
JSF++ AV Rule 152:
Multiple variable declarations shall not be allowed on the same line.
Rationale: Increases readability and prevents confusion.

NASA C Style Guide SEL-94-003 (probably out of date but I assume this rule didn't change)
Rule 5.4: Declare each internal variable on a separate line...

ESA C and C++ Coding Standards
Rule 46: Each declaration should start on its own line...
The rule means that the programmer always has the opportunity of adding or
removing declaration lines without having to modify other declarations...

SEI CERT C Coding Standard
DCL04-C. Do not declare more than one variable per declaration